DIY 2x range booster battery for electric scooter or e-bike

Learn how to make your own battery with my book DIY Lithium Batteries: amzn.to/2jbxvzS or check out my second book - The Ultimate DIY Ebike Guide: amzn.to/2BGx4Fn
This battery building kit from: www.vruzend.com
The gear I use for my videos:
Camera - Nikon D5300: amzn.to/2DcuVlM
Lens - Tamron 18mm - 270mm: amzn.to/2qLZlsG
Thermal camera for iPhone/Android: amzn.to/2FikWvW
Drone for "follow me" filming: amzn.to/2UFOds5
Camera for invisible selfie stick shots: amzn.to/2Vb9D0r
Here are some of the products I use:
Bafang BBS01 kit: goo.gl/VxhTHu
Bafang BBS02 kit: goo.gl/9cfWfk
Bafang BBSHD kit: goo.gl/dWX2pm
250W complete e-bike kit: goo.gl/7HSQye
500W complete e-bike kit: goo.gl/xWPgtj
1,000W complete e-bike kit: goo.gl/UdUWK9
36V 13Ah Hailong (shark) battery: goo.gl/K9PsuC
48V 15 Ah triangle battery: goo.gl/6zjneY
52V 17.5 Ah triangle battery: goo.gl/e1E8ug
All ebike batteries: goo.gl/7pAi9Z
All 18650 cells: goo.gl/hYWnwU
Xiaomi QiCycle: goo.gl/Ys6JTZ
500 Wh folding e-bike: goo.gl/UWgoJU
Weird suspension folding e-bike: goo.gl/T9xBqN
Segway ES2 scooter (AliExpress): goo.gl/32szNF
Segway ES2 scooter (Gearbest): goo.gl/25URD9
Xiaomi M365 scooter: goo.gl/iEQWJw
100W Flexible solar panel: goo.gl/jK1CSB
100W Folding solar panel: goo.gl/WnHmgY
Cycle Analyst: goo.gl/RsmE3N
The parts that I use for building batteries:
18650 cells: goo.gl/aEabAQ
18650 positive insulating washer: goo.gl/HBVOuc
Nickel strip: goo.gl/VIrNQq
Spot welder: goo.gl/KN3Uaw
BMSs: goo.gl/S6gSQx
Silicone wire: goo.gl/xmpbKD
Black 18650 cell spacers: goo.gl/hQxWF6
Vruzend cell spacers: goo.gl/5ReLqA
Large heat shrink tubing: goo.gl/6v1ow9
Small heat shrink tubing: goo.gl/OU3Z6u
Foam sheet for protecting battery: goo.gl/5e71tE
Kapton tape: goo.gl/D6BT57
Chargers: goo.gl/js0T0V
**Question response book giveaway rules**
When you guys asks questions in the comments of my videos, I'll try to answer them. If there are questions that I think would make a good video response, I'll choose them to do a longer segment. If I choose your question for a video response, you'll win a copy of my book The Ultimate DIY Ebike Guide (the paperback or the ebook), or my book DIY Lithium Batteries.
Here are some things that KZbin makes me say: This contest is not sponsored by KZbin and KZbin isn't affiliated with it. I'm supposed to provide a link to the community guidelines for KZbin (www.youtube.com.... KZbin is not a sponsor of this "contest" and by participating, you are releasing KZbin from any potential liability, whatever that might be. Privacy notice: I won't steal your info. If you do win, you can choose to send me your address so I can mail you a paperback copy of the book (or some other prize if that changes) or you can send me an email address and I'll send you a copy of the ebook. I will do everything in my power to immediately forget your personal information afterwards.
Outro Music: BenSounds

[@alexadamyuk4585]

A whole swat team invaded my house because my neighbor thought I was building a bomb in my garage...

[@erikyordanov7707]

Loool

[@flite4u]

Lmao that’s hella funny

[@semi8515]

Really?

[@jg726]

It's true, I was the neighbor

[@ebperformance8436]

🤣 🤣😂

[@streetgainer]

WARNING Most scooters do not allow operation while something is plugged into the charge port. For safety reasons obviously. Also, the charge port is meant for just that, charging. It has specs that are totally different than the operating mechanism of the scooter which is powered by the battery. Look at your charging adapter and read the specs on it. For Gotrax it’s 42v 1.5amp, you can’t just stick homemade battery pack of 37v 7amp into the charge port and say away we go! IT DOESN’T WORK THAT WAY AND IS VERY DANGEROUS!!!! For most scooters charge port the best you can do is build a portable charger that you use to RECHARGE the scooter battery when it’s low. The same build principles will apply as shown in the video, however, you have to build it with specs intended to take the place of your wall charger for the sole purpose of charging not giving your ride a boost. So when planning you need the voltage on your battery build to exceed what’s stated on the charger, for example if your charger states 42v dc out, then you want your build to output around 47v. Then you have to match the amps, you can reduce the amps on your battery build by using a current limiting resistor across the pos/neg end of you battery. You use ohms law to get the proper resister value for the desired amps, I=v/r where “l” is the amps you want to achieve and “r” is the resistor value needed. So in our Gotrax example you’ll need about a 28 ohm resistor soldered across the total neg/pos end of your battery build on the output connector not the connector you’re using to charge your battery build. This will get you to the 1.5 amps needed for charging and will not damage the components on the other side of the charge port or melt any wiring inside your scooter. The reason you can’t just stick 7 amps into a port that’s only designed to accept 1.5 is obviously the wiring and circuit behind the port may not be rated to accept such a higher amp value. THIS IS HOW FIRES START!!!! If you’re gonna do this do it right, for the safety of yourself, your family, and your neighbor. Lithium Ion batteries are NOT to played with.

[@user-rw9eu5km8g]

Are you sure?

[@user-nu2cs1ch4l]

I was also thinking this. That 250w motor is drawing max 7 amps. Meaning that the extender battery has to provide about 3.5 amps if they are both the same capacity, more if higher. My scooter is the same model as his and the charging port is fused at 3 amps. Idk how he made it work, if...

[@markevan1]

There are major errors in this tutorial. He may think he knows what he is doing but following his instructions leads to an installation that can cause a fire. Some of the reasons for the danger have been revealed in the comment section. DO NOT parallel this system through the charge port! No qualified professional would advise you to!

[@LeanPocketDiet]

Isn't dangerous to use the charge port of the scooter for the parallel battery? In general the wire in the charger port is rated for 5 amps not 30.

[@jrodrims27]

Are you sure this is safe? Matching the voltage is easy but what about capacity and chemistry? Can you safely boost through the charge port? Is that really running parallel? Can you boost a regular lithium battery with a lifepo4 of the same voltage through the charge port? Really? This isn't really running them parallel is it? Thanks!

[@whitcwa]

You make many good points. Matching capacity is not necessary, but matching voltage is. So mixing LifePO4 with "regular" Li-ion is a no-no. I would not use the charge port. It does not have the same wire gauge or connector capacity as a discharge wire and connector. I paralleled mine at the battery power out wires, and I disconnect the external pack to charge them separately. It charges twice as fast that way. It was easy to run a couple of wires out to an XT connector. I used a pre-made battery pack because it is a lot easier.

[@kittymuffins6484]

For years, Micah has helped to make it more possible financially and technically for folks to acquire for themselves, small vehicle electric transportation. And he endeavors to bring more useful information and products needed in the future as well. The competition does not like that. He is really a nice fellow that loves people and wants to help others, and he does spend the time and effort to do so. A+

[@electro353]

How do you limit the output of the booster pack to 2 amp at 42v? Most barrel connectors are low power. You might be able to do 3 amps but any more than that you will melt the connectors. I have been wanting to do this for a long time but the amount of power the battery can output concerns me alot.

[@patrickmiao1698]

I have the same problem. I would like to limit the booster pack to 2amp

[@leluthebluebayshepherd3551]

Hey Mika cuz I have a GoTrax GXL v2 also & literally have 2 of there battery packs that go into the frame. I was just wondering if u could just let me kno the easiest way I can wire those 2 together in parallel so I can double my capacity on the scooter pls🙏🏼🙏🏼... I was just bringing them both fully charged with me but after watching ur video/s Im still confused on Doin it with these types of batterys...thanks alot & love the vids!

[@PaulAndHarris]

Cool video. It seemed pretty simple until about 4:00 in. That's okay. I'm slow. I still learned a lot anyway. Thanks!

[@carlosgamboa6910]

This is a great project to do considering getting twice as much range. Thank you for the video.

[@cedrikkaurit3078]

How does the charge port handle a battery connected directly to it? If I look at the wires behind the charge port, they are way thinner than the cables connecting directly to the original battery. Will the extra battery load work with the charge port or is there risk of faster wear in the long term? Maybe swapping out the charge port wires to thicker gauge wire would be a good idea?

[@kevmack101]

SWEET VIDEO, I just hooked up my Dualtron Storm battery to my Wolf King GT and I can say this thing is now the ultimate scooter. Basically 67AH. Check out my latest video's on it...

[@leluthebluebayshepherd3551]

Hey Micha, I was wondering how would I go about wiring 2 of the exact same Gotrax 36V stem batteries for the GXLV2 scooter in parallel? I'm a lil confused cuz of the 3 pin triangle output. Thanks buddy & great vids as always

[@normlewis4686]

well, i got the book and I know I'm in over my 70+ old mind. but my #1 question is what class and how large of a fire exchanger is needed to ensure a few remains?

[@StartledPancake]

A true Renaissance man is one who can solder, skate and sew.

[@brokenwishbone422]

Its perplexing how much people use things but don't have any idea how it works or how to fix it. Down to the simplest can openers (or even the can itself). Ever since I can remember I've been taking things apart out of curiosity and fixing things. I would probably go insane if I didn't know how to fix the things around me or how they work lol.

[@brandonstevens1832]

@@brokenwishbone422 WOW WE ALL LOVE AND ADMIRE YOU TELL US MORE ABOUT HOW AMAZING YOU ARE I WOULD LIKE TO HEAR IT MAYBE START YOUR OWN YOUSTUBE CHANNEL AND TELL US HOW AWESOME YOU ARE AND WHY YOU ARE SO AMAZING??

[@brokenwishbone422]

@@brandonstevens1832 wow another fake ass tough guy on the internet.

[@brandonstevens1832]

@@brokenwishbone422 IM NOT BEING FAKE I REALLY WANT TO HEAR ALL ABOUT HOW AWESOME YOU ARE CAN YOU PLEASE SHARE MORE INFORMATION ABOUT CAN OPENERS? i WOULD LIKE TO KNOW HOW IT WORKS. I CANNOT USE A CAN OPENER! IT TAKE SOMEONE REEEEEEL SMORT TO NO THAT 1!

[@brandonstevens1832]

@UC0VTSR-7DahzeAQ5sdOS-uQ YOU ARE INTO CAN OPENERS AND NOW I FIND OUT YOU ARE ALSO INTO HAND TO HAND COMBAT OVER THE YOUSTUBE!!!?? OMG THANK YOU FOR YOUR SERVICE IN THE UNITED STATES PENITENTIARY SYSTEM! YOU SPENT 7 LONG YEARS WITH FELLOW MEN ON THE SAME CLASS! THAT IS NOT EASY! YOU SIR ARE BOTH STUNNING AND BRAVE!

[@Tennouseijin]

I suppose it would make sense to put a fuse in there too, just in case you ever accidentally connect the booster when the two batteries are not at the same voltage. Anyway, I'm looking for good sources of info on building a 'split pack' where a vehicle does not have a convenient place for a single large battery, so you might want to put multiple smaller batteries. While the basics are obvious (the batteries can be connected in parallel or in series, as if they were a single cell), and some safety concerns are obvious (keeping the same series number when connecting them in parallel, making sure everything can handle the voltage and the amps etc.) but some details are less clear and it seems there are different ways to do it, different ways to solve the problems inherent to this system, and I haven't yet found a good definite place to look for information on that.

[@EbikeSchool]

Sorry for the long break between videos, everyone. I’m already almost done with my next video which is a really cool project I just started!

[@TRICHOMETRIST]

Right angle male , that is going to break off I dont understand why they mount the key for battery like that too It's an accident waiting to happen Kool video tho ! Thumbs up

[@BrunoPOWEEER]

EbikeSchool.com yeahhh I totally understand long break between videos hahahaa not easy to keep up recording and editing in a weekly basis... you’re doing it pretty well, much better than me hahaa =]

[@nikon626]

I see in the video you used a DIY Arduino based spot welder and you also have an Aliexpress spot welder linked in the video description. Which do you prefer?

[@ThanosSustainable]

@@nikon626 actually, he didn't use a spot welder. he used the Vruzend kit.

[@nikon626]

@@ThanosSustainable 2:05

[@DaCleva1]

I tried to build the same thing and blew up my house.I think I missed a step. 🤔🤔🤔

[@davidgriffin8482]

I'm going to build my own scooter. I think they are high as hell. What is the general cost on a battery pack like you made. And do you think it would be better to use bigger batteries with a similar system?

[@johndavidpeer3107]

Subbed. What a great video! I loved it; From his reasonable pitch for his book, to what he creates in the end, that blew my mind! There's a business opportunity with someone with the basic chops! Including sewing even. Awesome.

[@jamesdepuydt3610]

Great videos, watching with intense interest and am considering building my own 48V-20Ah battery for second battery on my ebike. keep up the great work

[@iraira2818]

Micha, Thank you for this video. Question: I feel super confident I can make a battery such as the one that you made in this video; but if I ask you super nicely will you make one for me? I have a scooter identical to the one that you have. All of your services and fees I will pay you. Micha, Thank You.

[@trade5149]

I second this, what would it cost for you to make and ship this? I would be interested. I have a Gotrax that gets 12 Miles range. I'd like to get close to 20.

[@tamperdata1]

I third this. Please sell these as gotrax doesn't sell extended batteries

[@newsflex]

I concur

[@lee-tx5mw]

just buy a battery 36 v 7.5 amp hour and suitable way of attaching it thebpart i missed was conectiongvto the type of battery in these gotrax scooters .i have one laying around and had a look at is design .i would go for a 365 type scooter or but a bigger ah scooter to start with .if youre looking for one .as a budget scooter the lower center of gravity .given the battery is in the base having 15ah of battery on the steering tube is a bad idea for a few resons esp if swaying around like that bag will it will affect steering and make it heavier and maybe even shakey it could come unattached and isnt very waterproof .this is a good idea if you have a pannier rack on a e bike and could hide and waterproof it in a pannierbag otherwise buy a bottlecage mounted type and fit it to the rack somehow .but put a mudguard on as a precaution too .great videos though i just dont think this is a good idea .just buy a xiaomi 365 or similar the 350 watt version does 21 mph and comes with decent range on most models

[@edsy3203]

Very good instructions but can I just buy it from you😫😅... it’s quite intimidating to do all🤪

[@phatalextran]

hello, i been seeing some divvies online claim that you can connect 2 batteries it in parallels and even have mix voltage. like 48v and 52v . datex2 is one of that devices. can you shed some light on them? and how they doing it ? thank you

[@barryallisonve3njk]

And yet another very informative video. Thanks! PS DIY battery book is a must for anyone wanting to build a battery pack. I've read my copy more than once and learn more each time. Thanks Micah.

[@benpar8120]

You need to mount the battery pack much lower as you have raised the centre of gravity of the scooter.

[@easternwind4435]

Half a kilo will not make a difference

[@SKBKER]

@@easternwind4435 It will

[@TheLondonCyclist]

@@easternwind4435 It does, especially on a scooter. The slightest weight can mess with handling.

[@Cho.0k]

Thanks for the time and effort you put into these videos! A video on wire gauges for power wires and battery capacity would be great! I want to build a pack, but worry about burning up the wiring if it supplies too much power :p

[@morganandmike324]

Is there anyway to just buy something like what you built? If so can you direct me in the right direction. I just purchased the gotrax gxl v2 and I’m not comfortable building one myself. I was looking at Segway because it had the extra battery but the price is a lot more.

[@ammandeep]

Can I use the booster as a portable charger? When my scooter battery is down, can I plug in the booster to charging port and leave my scooter aside while it is charging? Will this cause any issues to my battery?

[@dtape]

According to Micah's instructions, you should only connect a booster battery to the main battery when the charge levels are the same. If you try to connect a booster battery after the main battery is low that might be dangerous, with too much power going from the booster battery to the main battery at once. As I understand it, you want the charge levels to be the same so the power only trickles from the booster battery to the main battery as needed when the main battery is in use and slowly getting used and discharged by the vehicle motor.

[@lawrencejackson5032]

I send you a video and I like the I got to email cuz I'm trying to push the battery power up so I can go like 50 miles can you help me out

[@younghomieprodustion]

Does anyone know how he got the cable to connect the battery to the scooter

[@qmriis]

huhhh. It's OK to connect batteries with different AH / WH capacity in parallel?

[@Jed0991]

Yes

[@mudflap2020]

How much for the scooter battery combo

[@denyboy97]

@EbikeSchool.com Thank you so much for making this video Micah! I owned 2 original GOTRAX GXL scooters one for me and my Girlfriend. The range was really becoming a problem especially if we wanted to commute, take long rides in the country or on Holidays here in the U.K. After watching your video I was on a quest to build the exact same exact batteries you built for our scooters and with the guidance of this video, few month of making mistakes wiring my connectors incorrectly, shorting 2 chargers and 2 scooter batteries they are finally finished. I’ve build 2 of the exact same batteries using the V2.1 Vruzend Kits with 3 cells in parallel using Samsung Q30 cells with a capacity of 9 Ah each and man is the scooter even faster than before, it does 22mph all day long now, so fast I wear a helmet as it’s just as fast as my Brompton Bike. If not faster!! 🛴 💨 💨 All credit goes to you Sir, once again thank you for the awesome content! I’ll be posting a video of the finished builds soon for watching for name in the video credits.

[@stonedmetal666]

How did it hold up?

[@itzmykel4001]

Great idea! Would you make one for someone who would pay you ? Lol i have a gotrax gxl too ! Would love to have this but have no time or patience to do it myself lol

[@elveneye]

itzmykel ditto

[@nickkkharriesss]

I am here just for this comment. Yeah ima buy one of these.

[@irshadakr]

Me too if i can buy one

[@electricmotionhawaii]

is it really that simple to connect two exact same voltage batteries in parallel by " plugging that pack in to the charge port of your e vehicle battery ?

[@gerardjachymiak5822]

Yeah it's just like adding more cells to the original battery

[@electricmotionhawaii]

Haven't gotten to it yet but I want to add a aux battery pack to my electric motorcycles. This way looks the most efficient .

[@snohman1]

yeah I want to know as well.. when i plug in the wall charger to my scooter it doesnt run... is it because its ac? so once i build the battery i just plug it in and it will work or do I have to bypass something? and then how do you charge the extra battery pack?

[@kevmack101]

hey great video , WILL THIS WORK ON MY KAABO WOLF KING GT 72V the ato switching one. and will it drain from both batteries at the same time so I get less voltage sag also would a simple parallel conection work if I use two 72v batteries one is 35 mah and the other is 32. Will it work with no issues

[@Jed0991]

How did you get the scooter to run while plugged in. My scooter won't turn on while plugged in and I don't know how to disable this.

[@snohman1]

yes how does this work? did u find out? I was wondering if u needed to bypass something as well? lmk

[@muneerhataf]

I have a question. I have bought your book on amazon in pdf firmate and i have a scooter having 36v battery with 4.4AH. Its does not give me a big backup. With this battery. Ican run only 10 Km nearly. I need more backup like 70 to 80km. Like commercial scooters. If i increase batteries or Amperes can it give me big backup. Waiting for Answer sir. Thanks

[@lukeporter2470]

I've been looking in to ebike's and batteries. And I see you name and gear in the top 5. Now that I've seen some of your videos. I'm more determine then ever. And I think it's better to build your own if possible. I tend to take so much more pride in the work I put in to making something. But yet I'm not the best at so I could use some help. Lol 😂😆 I live ebikes I got my own welder just to build my own electric vehicle. ?) !!!!!!! 🔋🤑😇🤠

[@powerpopjoey]

Lots of other people saying that this will definitely damage the internal battery over time.

[@bobravenscraft5376]

I'm just building extra backup batts. You are thinking like me

[@theairstig9164]

I used a step up voltage converter and two Ryobi One+ 18V batteries in parallel. As the batteries are removable I can charge them both at the same time as the scooter if I have three sockets. The step up converter provides a constant 52.2 volts in to a 54 volt pack at about 3-4 amps. This means the 18 volt batteries are delivering in excess of 10 amps until they are completely drained. The power protection electronics in the batteries shut them down if they overheat or under volt. It’s a few layers of protection but if the batteries die, I just buy a another One+ battery. Do not connect the supplies with more than 1 volt difference unless you like loud bangs. I already have a copy of your book

[@fallingwater]

Spams his expert DIY battery building book, tells people to connect their booster packs through the charging port. ANYONE WATCHING: DO NOT DO THAT. THIS IS BAD ADVICE. The charging port is not meant to take drive current, just low-amp charging; it has narrow wiring and a small connector. If you do this and you're lucky, you'll lose a lot of power through wire resistance and the booster pack will work inefficiently. If you're unlucky, you'll destroy the charging connection. If you're really unlucky, you will melt the wires and quite possibly short out all the things and set fire to your scooter. The only proper way to do this is with a Y-cable at the main battery connection using suitably thick wiring.

[@ebperformance8436]

If you have a 72v 20ah battery with a 80a BMS could I simply use a second 72v battery for more range….No BMS? Would the battery with the BMS continue to keep it at 80A But increase the range? The speed is fine….I just want to increase the range. When building another battery…and you have the cells matched with the main battery, would I have to multiply the individual volts on the cells…to hit my 72v’ example…if each cell was 3.7 volts Wouldn’t that mean I can only use around 21 or 22 cells…to achieve a 72v battery?

[@krispipes]

can you make this battery and sell them online? ill buy one :)

[@jasonfelix9051]

Count me in

[@mattgithens1979]

DO NOT DO THIS MOD!!! We did this to my son’s Gotrax GXL v2 and it burned up the charge port within a few miles. We cannot charge the scooter now. I took the battery out and charged it via pins 1 and 2, we now have to mod the scooter so we have some way to charge it.

[@TecSanento]

I guess you plugged it in, when the scooter was empty and the booster was full? That turned the booster into a super super charger - what the cable and plug is definitely not designed to handle

[@mattgithens1979]

@@TecSanento No, they were both at the same voltage because the scooter had been used that day. It burned out while being used. The charge port is designed for 42v / 1.5A, the draw from the motor will max at 250w at 36v... So a total of 7A could be pulled... And let's just say half comes from the external pack = 3.5A!! And that is the issue. I soldered leads to the inside of the controller where it connects to the battery and the scooter has been ridden like this for about 500 miles.

[@TecSanento]

@@mattgithens1979 yeah that would be my Next guess - glad you figured it out. We would need some kind of current limiting

[@mattgithens1979]

@@TecSanento on the other scooter (XR Elite), we just put a XT60 Y cable in the steering tube. When you remove the handle bar, the XT60 is just a few inches down the steering tube. I put the Y there and a hole with a grommet… then used a bike bag for the 10S4P battery. All in, we are getting 30 solid miles on a single charge. If I were to order today, I would only buy scooters that have the battery in the “floor”. I can’t remember… but I think the XR has a more standard 10S3P down there. The GXL V2 has a special made pack in the steering tube which means you’ll have to buy from them… at 3x what the pack is worth!!

[@whitcwa]

@@mattgithens1979 That's exactly how I added a battery to mine. It has worked flawlessly. I added a 15A fuse for good measure.

[@jesp999]

Im reviewing this again and I think the way it is described it can damage some internal batteries and even cause death if your not careful LOL The safe way I think to build a booster for extra range that plugs into the charger, would be a pack exactly to mimic a wall charger. So you build it up 6 volts above your bike or scooter battery voltage and limit the charging amps coming out of the booster pack to maybe 5 amps or 7 amps with a current regulator. You could even just have it a 2amps, but that would take a long time to charge. When you regulate the current and charge 6volts above the lithium's voltage rating then your booster is acting just like a regular charger and the internal BMS will manage the charging safely and correctly. For example if you have a 36v ebike then you make a 42 volt booster pack and attache a current regulator to the dc out. So in other words your not connecting in parallel, but creating a portable charging system. and the goal of this is not so much to instantly double range for riding continuously, because the safer style of i being just like a charger, would make the charging time slower than the discharging from riding, but it would increase range and work great for the type of riding where you take some brakes and not riding continuously so the charging could catch up with the depletion from riding. For example if you go to school and your bike is parked outside then the bike "re-charges" from any depletion from the booster while it is sitting without an external wall plug. LifePo4 cells can be damaged by charging too fast, and even explode, that is even why Micah warns in his video the voltage of the two batteries needs to be the same and in the same state of charged if connected parallel. It cannot just connect a dead battery in parallel with a fully charged booster. So it is dangerous if you were to drain your battery from riding and then plug in a fully charged booster directly in parallel because two much current all at once would run through too fast into the lower "deader" battier. EXPLOSION DANGER!!!!. So a current regulator is needed and then you can connect even a 6 volt higher pack with even a lot of watts, as long as you regulate the current going in to the charger it is fine. Now maybe you can do exactly what this video says exactly with the booster being the same voltage (charging both up fully like in the video) but only if your really know your ebike or scooter really makes the charger port act like a true parallel connection. If you read carefully all the comments below and answers from Micah to other people questions and compare them all and the video, you will see he has contradictory statements in the video and his comments and might not know what he is talking about for your scooter. He says it both that it is creating a parallel connection sometimes and other times he says it is just acting like a charger. If it is truly parallel it is not at all operating like a charger but simply powering the motor of the ebike at the same time as the internal battery. It might work in the scooter Micah tried it in because in that scooter it is totally a parallel connection. It is really tempting to do this if your bike or scooter can handle it because everyone sometimes wants more range, but I would suggest to people to research more what kind of connection your charger port utilizes and how it wires through tour particular bms to charge the battery. You need to know if it is parallel and then you need to know how to be very careful, or take the safe route I suggest above and use a current regulator between the booster and the charging port to the internal battery

[@rogerlane2282]

Thank you for sharing that wealth of information. Was going to try this but what all you mentioned makes sense. I don't think I am going to try this.

[@quynhchi148]

And just extra information, many el scooter and el bicycle manufacturer selling extra battery just like this

[@jesp999]

@@quynhchi148Its probably the case that all e bikes and scooters are not exactly the same in terms of bms and circuitry protection. I would like to understand what kind of BMS the manufacturers that sell extra battery packs use. MY escooter is a popular model and it does not have an extra battery and I am going to take it apart and look at the bms. I want to learn more about BMS's. Of course it can work with some as in the video above, but since the explanation in the video and discussion below have inconsistencies I wonder what the distinctions are in the BMS' that make the difference. In theory if the batteries are not matched a lot of current can flow when they are first connected because they will want to balance with each other. I do a lot of research into boon docking batteries lifepo4 I know there are different types of BMS's. Some of the brands of battery packs are listed in their specs that they can be put in parallel (adding a second battery) or and some are clearly say in their instructions and specs that they cannot. Unlike buying lithium "deep cycle" power storage batteries, when you buy an escooter or ebike these kind of details are often not listed on the battery pack because they do not like people to hack the batteries. In boondocking batteries like people use in rvs and vans they area usually made for some versatility. Will prowse has a great channel on these type of batteries. kzbin.info I would love to extend my ability to travel long distances. It is not hard to build battery packs. Maybe people do not know about this option. If it is safe on most scooters or we had a list of major scooter brands it works on that would be good, If someone else has a better description explaining why this can work with proper care just as described int he video above in terms of bms types or more details, please share. I think we are at the point where people are going to build self made electric motorcycles with Nissan leaf battery packs for long range travel. .

[@quynhchi148]

Why rechargable battery cell that doesn't allowed parallel connection? maybe they just be cautious because the cell has too small of the internal current and by parallel it decrease the resistor by n times and it make high current flow when the voltage different is significant?. If that's the case i would do the top balancing and use the current limiter and voltage limiter so it would work just fine. You're right about the balancing, that why i said the voltage must be somewhat the same for the input battery and the scooter battery.

[@jesp999]

@@quynhchi148 ​ Your right cell internal resistance is something they must make the decision on but also other things. Like Im sure the manufacturers that allow a second battery expansion have a proper plug and proper gauge wires to handle the current where the connection is made between the batteries. High current bikes need very thick wires between the batteries and the motor. If one puts batteries in parallel one needs to use the right gauge connection. (BTW fully charged 1860 cells are 4.2 volts.) So my line of thought is if it is not a biked specked to do this and if it is a very high power bike or scooter say above 1000 watts, that is a lot of current to run through the charging port. Im not sure if BMS can handle the current but I know from my experience doing stuff in my van with high current DC wires get hot and the longer the wires the worse it gets. Some charging ports in rare cases are a few feet from the battery, but even a 3 inch wire if the wrong gauge can melt or act like a fuse. So if one beefs up ones wiring maybe the mod is ok. But also if the plug is not rated for high current the plugs and the plastic around them can melt. Some scooters are 52 or more volts and 30amps. a lot of chargers and ports use like 18 or 16 gauge wires built for charging at 1.5 or 2 amps, maybe 45-150watts depending on the bike charger system. So it depends on the system one has. Also if one runs a ebike at full speed the motor can draw a lot of power running through those tiny wires, even if they do not fail it will create a situation where the battery closer to the motor runs out faster. So it is not that lithium batteries cannot be put in parallel, it is how one does it that makes a difference. It needs to be done in the right way. When I say some battery manufacturers say "not for parallel connection" it is because they did not make the battery wiring and bms strong enough to handle that. A voltage and current regulator can help provide safety but then one would still have an issue if that then makes ones built in battery run out of juice first because its wiring is more direct to the motor and the proper gauge for the current to flow to the motor, but the secondary battery is limited and will discharge much slower. So your ebike will run on decreased current or not run at all if voltage drops when the first battery runs out. I did not think of the wiring and charging port till now before I was just thinking of the BMS, but this issue of wiring gauge and type of plug connecting is a bigger issue for trying this mod bike and scooters with a big current draw. I think one needs to know ones scooter or bike well before trying it.

[@oahu7873]

Great video as always. Made 3 5s9p batteries with the help of your videos.

[@rachidbaaira9869]

great video as always, plz I have a question : can I run Xiaomi scooter 250watt motor with hoverboard 36v batterie ( 20 Samsung battery)?? tnx

[@brottochstraff]

What if i want to add second battery more permanently and charge it when its already connected with the scooter? Seems like to much hassle to always make sure that they are at the same charge level when connecting, i was expecting a more "powerbank"-like functionality, or like the iPhone battery case wheere you just keep it on your phone at all times.

[@mcgavin098]

There's tons of those hoverboards in pawnshops that contain a 36v lithium ion battery pack. You can get the whole hoverboard for about 20-40 bucks. Voila!

[@LennyLindell]

hello, I wonder about soft pack lithium 48v if the charging port is broken, can I charge the battery on the xt60 connector of the output the one to the sooters ontroller? are they required to charge on the charging input [laptop connector) is it difficult to splice otherwise?

[@lejend69]

How much would u charge to make me a battery pack ?

[@jasonfelix9051]

Me too... I got GXL V2 ... I'll buy the battery pack as well

[@duelmaster20]

Can you make me a new battery for my hover 1 alpha electric scooter. My battery is not lasting long like it was new i.think it burn out run out quick. I cannot find to replace or scooter store

[@VictorIbelles]

There’s something I don’t understand, other videos connect the external battery to the internal battery, but in this video you connect the external battery to the scooter charger port? It’s the same thing? Both are parallel battery connections?

[@drtroyturner7464]

Come on Shark Tank. Why isn't someone marketing this and cutting out the middle man?

[@eddiekytia]

EBIKESCHOOL....... I HOPE YOU SEE THIS. Thanks for your videos foremost... I own a kaabo wolf warrior electric scooter it has a 60v 35ah battery with 2 charge ports so if I make a 60v 15ah battery and plug it into 1 of the charge ports can I leave it plugged in and use the 2nd charge port to charge the original and new booster battery at the same time? Also wanted to know if both batteries will discharge at the same time,as 1 battery? THANK YOU FOR YOUR HELP!!!!!!

[@user619tlsdca5]

Wanted to fyi you of the topic on the WATT numbers on motors and what to look for of certain companies that advertise of what they have to sell. I came across a sale on title of 350/500/750 watt e bike and remember what you mentioned and I notice this as the Bike is all the same with the 500 and 750 having bigger tires than the 350 including the battery for each one. Well, I know enough now I went ahead and got the 350 watt GEARED Bike and I just swapped the battery intended for 350 and got the one separate of same specs of the 500 and 750 they were selling. I basically got the 750 without their fatter tires and higher amp battery, lol. Im going 24mph on the 350 daily of new battery of same amps as the 500 and 750. I saved 300$ of getting the 350 watt which actually is same motor for the higher priced ones of same model. Its really a 1000 watt motor as I checked the wattage amps when I juice up throttle all up it reads 1000 to 1200 and it drops to NOMINAL OF 500 to 750watts once on cruise control and dips down to 50 when I use PAS at 24mph.

[@kevinrickey3925]

Hi, I liked your video so much, I bought your Book! Thank You for everything!. Take Care Friend :-)

[@RyanDimal]

Ooh some interesting info here. Thank you.

[@lordgabrielplaton9941]

Hejsan, in my language, l am very interested in your work, l learning very much from your experience, l have no knowledge, but l want to makes my own E-bike battery, after my own conception, l appreciated so much if you are caindly to answer

[@7KingCobra7]

AWESOME! Will this work with my gotrax xr ultra??? Did yours last???

[@frankroder647]

Great video,can you help out and answer a question for me? I picked up 3 GOTRAX rival scooters for my 3 boys I was thinking about extending the range on the scooters. I have a few new hover board battery packs from hover 1 boards and I was thinking about installing the same male charge port on the battery packs to mount them on the decks and run the wire up to the charge ports as you did ..can this do the same thing as you build? I'm assuming it would.but any insight would help before I blow up my kids......wife will kill me Thanks Frank

[@honphan4366]

Hello Mica Can I parallel these 2 battery packs Both 48v lithium ion 18650 LG cells A 13s 7p with 210 amps continuous And a 13s 20p 200 amps continuous Thanks in advance Hon

[@PeterOrrick]

Thanks for the awesome video! Wondering - re: GOTRAX GXL V2, any ideas on how to 1) increase max speed 2) kill the Cruise Control feature? Thank you in advance for any helpful leads!

[@flaviomiranda4918]

Question, what are the part numbers for the plugs you used? I cannot find them in the list of things. My son has a GoTrax G2 and I want to build him an external battery for added use time. Also, do I just use the same charger that came with the GoTtax to charge the homemade battery? You make this fun!!! Thank you!

[@hippiness1]

Alright, I finally got around to doing this and it was a fail. The person making the video is WRONG. The charge port is NOT spliced in parallel into the battery. It goes to very thin wires that are welded to the circuit board. So within about 2 miles, I fried that part of the circuit board and can no longer directly charge the scooter battery. I went ahead and removed the charge wires and spliced in two thick wires directly into the hot and ground wires coming off the scooter battery (which was difficult because those wires are only about 1.5-2" long) to the new battery. This seems to be working fine and I can charge my extra battery while it is spliced into the scooter battery and they both charge up equally and my backup battery's power management tells the charger when to stop charging (if I bypass my backup battery, it seems to want to overcharge the scooter battery now). Anyway, this was kind of a headache and I regret trying to do this. An alternative that is much safer to your scooter would be to buy a small 100W "solar generator" (what they call them, but they are just a lithium battery attached to an inverter that "can" be charged with a solar panel, but also with a normal 120V outlet) and mount that to the scooter and just plug in the charger and have that running while you ride. That keeps the amperage at a safe level that you know won't damage the charge circuit (I believe it is 1.5 amps - you might be able to get away with a slightly stronger charger, like a 2 amp and eek out a little more distance). If you ride hard, it will give you about another 2 miles. If you are riding slower or waiting a lot at stoplights, it will go much further. This is what I was doing before I tried this upgrade. On the plus side, my scooter will now go about 20 miles (I wired in a 20Ah battery), up from about 6 miles. It is just not a very good setup and feels pretty sketchy to me. I bought a new handle bars that have all the electronics that were ruined by this hack in case I want to switch back. Right now, it only cost $59.

[@Ukw975]

Great video.thanks. Ok know voltage .5% up or down difference makes no difference but what if use a 36v4.4ah on a 36v 5.2ah battery for go trax rival and can I buy one already made with different ah but same voltage and splice tip of wire or connector to plug into my gotrax rival for extra diy power?thanks...

[@1stawesome]

This will not work with Xiaomi mijia m365. Because u need to downgrade firmware and a lot of different issues. Because also m365 has smart BMS and after connecting add battery scooter simply flashes and beeps showing error like "u can't ride because I'm charging right now". So good luck ;)

[@george4658]

Thanks alot for the video bro, was really helpful for us us noobs to understand. So as long has my new battery pack is the same 72 volts,I can still use a higher A.H ( 80ah) than the existing battery (35ah)?

[@alanstowing1]

Great video. I have the Go Trax Rival and read some really bad reviews . And of course no customer service line ... Just email responses in 72 hours Asking for this or that. Then when you respond 72 more hours ( each time ) on response and a different rep you have to explain the whole issue and history of problem with each time per many many reviews. I've had no issues yet as in 2 days of ownership and have 30 days to return if I am not satisfied. I like the scooter but it seems Go Trax Customer Service is not user friendly and the longevity of the batteries installed and the charger wind up being very short lived. Ninebot and Segway have the best and longest lasting scooters with their lowest priced model priced at $439.00 plus a $20 off Coupon. Just curious on this battery system.

[@freddysaenzdastylist]

Just got a 60V 21Ah battery electric scooter. I'm planning to build a extending range battery. Can please someone point me to the right direction?.. do I need to build a 60V 21ah battery? Can I make a smaller with more Ah power? What would be the best recommendation.? Thanks in advance

[@infonator1]

doesn't the battery have to have a male connector to fit in the scooters charging port and doesvit also has to have a female to charge the auxillary battery?

[@ronnyterjesen7541]

Hi and thanx for great video's. I was wondering, do u know of any great app for monitoring battery health on scooters.? Thinking of both m365 all of them and Ninebot.? Thanks again from Norway

[@videosonix4473]

I built a battery following your instructions and with all the same parts. However, I don't seem to be getting any kind of boost when in use. Stupid question, but when fully charged, I should read 37v across the booster battery output terminals, right?

[@ucheucheuche]

Why aren't people selling these packs?

[@3d-speakers945]

Becouse building them is easy

[@Boss-ej1fh]

People are selling them just have to look around

[@3d-speakers945]

@@Boss-ej1fh they are but way to expensive

[@بینام-ذ6ض]

Google unitpowerpack batteries

[@TheKajim2]

Thanks for a good video. I have a turboant x8 max with removable battery. Do you have any good advice for connecting a battery like the one you build in the video. My turboant cannot turn on when charging. That's why I can't connect like you do in the video. I think I have to solder a plug on the wires inside the scooter?

[@roykositzky2252]

hello im roy K im 31 in the PNW and just got a gotrax scooter and i need more range out of it, im a dad of two great kids one my oldest it on the ASD scale and my son is a bit behind but we are going thourgh a really hard time,we lost are home and im just trying to do my best, i get around on a 5.2 Ah batt, so like 10miles at 12mph, will this work for my scooter, its the same frame and specs. thanks god bless.

[@turaspsico]

I have a question to make for you , maybe you are the only one that can properly answer. I want put two front lights on my 54v 18.2amp scooter , but the lights are 12v-80v lamps . If i direct conect them in the cable from my original lights in the scooter what kind a problem can happen , or if is okay to do it ? Thank you , i hope you can help me .

[@7KingCobra7]

I don't think that simply connecting a battery to the charging port will put them in parallel...

[@randybh1]

Thanks for the video. If I have a 36v 12ah scooter can I use two 18v 6ah Milwaukee battery's and run them in series? If so, would I need to hook anything else to it or just wire it?

[@XJeepWerks]

I have a DYU d1 36v. I’d like to use a ryobi 40v battery as a range extender. Could I put a quick connect on the original battery so I can unplug that battery when it’s low and plug in the ryobi battery?

[@grego15]

Can I make my booster battery with 21700s even if my scooter battery is made with 18650s? Will this cause any problems ?

[@hippiness1]

Really cool, but pricing all these items out individually is really expensive. I don't think it's actually cheaper than buying an already assembled 36V battery pack.

[@jasonwatt3433]

I have purchased gotrax g4. It runs a 36v/10.4Ah battery rated at 350w. Just wondering what vruzend battery kit I need.

[@redsnflr]

Dude's doubling his range to 7.5ah, I have a 7.5ah scooter and trying to double that range lol. This vid was 3 years ago so I think lithium ion batteries are cheaper now.

[@bobravenscraft5376]

Guys if like me you are not made of money I'm building. 3 parallel as extras no BMS hobby charger. Reason I can't risk my $$$$$$ store bought battery. Better to err on caution.

[@saifstudios3422]

I used a 36v hoverboard battery because I don't trust myself making batteries but other than that very helpful tutorial

[@wolfman3283]

I want build a 72v Wih that batterie For a scotter but i kinda lost How build it :) Well I kinda use a normal 5 batteri 12v 20ah . But people told me D'ion de Lithium Batterie are good and not so heavy

[@h1blaine]

i purchased a 36v 6a replacement battery. may i just plug this battery into the charger port on my kugoo electric scooter once i have charged both batteries to 100%. like you did on this video with your custom built battery pack. thank you so much for all you teach us. hal blaine

[@amirouw]

i dont think it would be totally ok to wrap the batteries with foam or flamable material ... firstly cause they can catch fire easily ...second these materials hold the warmth produced by batteries and this is not desirable since we need to get rid of it ... and the can catch the moisture . you'd better make a water proof light aluminum casing .. in this way its water proof and it easily transform the heat. but you should be super carefull to make durable contacts and wiring should be long life

[@TheSuccessfulHuman]

Would this work for my fluid free ride mosquito?

[@dumitrymd5557]

What happens if I put in parallel 36v .4 amp with 48v .15 amp ,please tell me is dangerous ? I want to put one battery from hoverboard to one scutter for range extender it is possible to do that?

[@Jamespennington71]

Saw a battery build similar to this last week. Do NOT build one of these and try to take it in your carry on bag at LAX. So glad it wasn't me. That dude %100 missed his flight lol.

[@michaelnguyen5949]

I'm thinking of building an extended battery but I noticed my electric scooter shuts off when plugged into charge. I noticed you plugged in the extended battery to what I assume is the charge port, will I be able to do the same thing or will my scooter shut off when charging?

[@GarrettHypes]

I just wanted to ask if you can use a Shimano 3 speed with a Bafang BBSHD on my Worksman bike? I can't seem to find information on this.

[@SandervV555]

i don't need to make the battery or pouch myself. Can i just buy any alieexpress 24 volt battery to extend my 7,8 Ah ebike battery ? can i use one charger to charge them both at the same time ?

[@MAplet1]

Great video! I would like to try this with my 48v ebike which came with only a 10a battery. I have subscribed,

[@lee-tx5mw]

i missed was conectiongvto the type of battery in these gotrax scooters .i have one laying around and had a look at is design .i would go for a 365 type scooter or but a bigger ah scooter to start with .if youre looking for one .as a budget scooter the lower center of gravity .given the baterry is in the base and not in the steering pole attaching another weight to this pile and not securely fixed wiill make it unstable prone to falling over heay steerin and unpredictable .slso not very waterproof .greatbidea fo a e bike fitted to a pannier rack .uve been thinking about this for a while id put in a waterproof panier bag and fit mudguards too

[@ayalaamaury]

They are in parallel but due to capacity differences they will not discharge at the same rate?