How to build an 18650 Lithium Battery Pack with BMS.

[@WesThatTechGuy]

THIS VIDEO CAN BE SEEN WITHOUT MUSIC HERE: kzbin.info/www/bejne/ppCrhalsismad7s

[@nayBobb]

Still has music😂

[@blank.24]

8p? Isnt amp is 20 for each sell and its 20×8? 160amp? So the bms take the 160 and convert to 20/25? I dont get it...

[@oisann8223]

hey can i do this with a 4s if so can i contact you?

[@ralorpa]

@@blank.24 Labels on the cells says 2500 mAh (2.5 Ah). Thats the capacity. 2500 mA load will work 1 hr. 500 mA load will work 5 hr. The guy says 20 amps, but that must be max current, and has nothing to do with capacity or lasting time.

[@markrobinson9876]

Interesting. I want to make one myself..But I wish there was a video showing you how to actually make a battery pack. I have searched 100s of videos and they are all the same. Add the batteries, add the BMS board and it's done!!! Which wire goes where? On the BMS what is P+ P- Exactly where and why? What is the tape you use? If this video was an hour long and it took you step by step for dummies. I would watch the whole thing.! 🙂

[@MrZhyk94]

Same 😂

[@joezoodie7865]

He says it in the video and has it wrote on the screen. It's Kapton tape.

[@filipzamec9671]

That music is abysmall, but thanks for the video.

[@davearduini]

I love Abysmal, they rock! 😎

[@MaxGoddur]

Where did you get the spot welder and other parts used in this video?

[@P-FIVE-ONE]

Probably a stupid question but can you charge the batteries on the load out wire, If so what voltage and amperage. Could I use a laptop socket, and charge them from a laptop plug??

[@WesThatTechGuy]

No stupid questions! Yes this is known as a common port BMS, you use the same port for charge and discharge. 12.6v max charge. 11.1v nominal. Yes a laptop power supply would work if 12.6v

[@P-FIVE-ONE]

@@WesThatTechGuy What would you recommend? I want a USB power bank for a phone and tablet.. Im using 14 (18650 Q30) cells in parallel (42Ah). I'm aware i could connect that to a Normal USB out board with a micro usb charge port but the charging times would be horrific and not good for the batteries i assume. so was looking at BMS, so i could wire in a better charging source. There seems to be alot of miss information or just bad advice its a mine field. any tips would be helpful as im starting out. Unless there is a better way that you can suggest.. Thanks for replying!

[@pb30869]

How would you charge this?

[@1minotm1]

to charge or discharge use the same bms terminals ?

[@WesThatTechGuy]

Yes, this is a common port BMS meaning you charge and discharge from the same wires

[@1minotm1]

@@WesThatTechGuy thank you

[@ricknelson947]

Awesome video, thanks for taking the time to share. A little constructive criticism. I would recommend a soldering iron with a little heavier tip. I also like to hit those larger joints with a flux pen to get a better solder flow. Your + and - connections looked maybe a little cold to me.

[@WesThatTechGuy]

Thanks for the insight!

[@DroneSurf]

I completely agree. I was suffering when I see the welding. Looks cold welded. I will not trust that weld.

[@ON3PDM]

Hi, Could you tell me if you charge the batteries via the BMS board or how do you charge and with what equipment.

[@mansgottado]

Great info.. music ruins it though

[@praisemonday4821]

Please what bms board can u recommend for 50amp battery pack and can also supports fast charging.. max of an hour

[@WesThatTechGuy]

Check out our website solargeni.com

[@brandenmuirhead8988]

I'd like to learn more about your spot welder. Is it a DIY welder or a shop bought one? Many thanks

[@ecorico22]

It should be a purchased item. Looks similar to a sunkko 737g+ . You can find it on Amazon

[@MathewZ788]

I am planning on making a battery pack out of lifepo4 batteries in 8s 8p config for my inverter which charges the battery and discharges it. I am having a hard time searching for BMS's for it any advice?

[@WesThatTechGuy]

We sell 8S Lifepo4 battery chargers at solargeni.com. We also sell the BMS you need.

[@MathewZ788]

@@WesThatTechGuy does it ship to india? with or without customs BTW?

[@WesThatTechGuy]

@@MathewZ788 Sorry no we do not ship to India currently

[@MathewZ788]

@@WesThatTechGuy damn aight thanks for the reply I guess

[@seanmikhaels]

cool video!, what about balancing each cell?

[@seanmikhaels]

Mark Cooper Agree, there could be tons of improvements, but i think its a good start. That particular BMS has a high current shut off i believe, and short circuit protection built in, but always wouldn’t hurt to be 100% safe and add some fuses to protect each cell from blowing up.

[@Nitrxgen]

Well... that BMS is designed for 3S and he does actually connect it the way it's intended, for the most part, with 4 nickel strips connecting to each end set of parallels. You can't really balance each cell per parallel because... they're parallel, they're connected to each other. The length of each strip may impact how balanced it is over time but those nickel strips should be pretty good while I reckon. I'm not a fan of this particular video but I dunno if I can fault him that much. I would've done a better job attaching the BMS and output cables though. I would've gotten a less cheap BMS perhaps with the wires already attached.

[@hansturpyn5455]

@@Nitrxgen you can't ballance each cell but you can ballance each cell row. The 3 cell rows should be ballanced separately.

[@micharogalewicz6249]

Looks super clean but, as others note, mostly due to lacking charge balancing.

[@amd4lyfe]

Can a connect two battery packs one chinese syncpower the other an lg battery pack together they are both 52volts the syncpower is 18ah while the lg is 23ah. I need more mileage so i need to connect an external battery pack to my scooter's internal battery

[@WesThatTechGuy]

As long as they are the same voltage you will be fine. Be sure to connect them to parallel.

[@KetansaCreatesArt]

Hello Wes That Tech Guy, I made my first 3s batterypack few days ago. Using 3 x 4 = 12 cells. I did not solder or weld them. I used the spring loaded 3 cell plastic containers, and glued them back to back opposite directions. No cell touches eachother. But from the top and bottom I attached lot of wires, positives, negatives, and balance wires that goes together to the BMS at one end. Then I ducktaped the whole thing. I am using it to run powerful 100watt LEDs on my bike. Is it safe so far?

[@oli236]

For your configuration you must check the maximum discharge current of your cells, in your case it must be at least 10A. Hoping the connectors won't melt obliviously

[@KetansaCreatesArt]

@@oli236 , Hello. It worked and I used it for few months. Then I dismantled it and spot welded it with proper method. Thank you for the reply 🙂🙂🙂

[@keithjackson1170]

Wes where can I buy empty shells or cases for all sizes of battery packs??

[@WesThatTechGuy]

These are hard to come by, you would have to try China most likely.

[@keithjackson1170]

@@WesThatTechGuy aliexpress?

[@WesThatTechGuy]

@@keithjackson1170 you can try it. Not sure

[@talhanaseer2404]

How do you wire BMS?Please explain it or give some link.

[@maazahmed9010]

What do you mean?

[@Nikoslido]

how do you charge it with a balance charger? lipo or pb setting?

[@WesThatTechGuy]

With a 12.6 V Lipo charger

[@WesThatTechGuy]

The BMS takes care of the balancing

[@justfly2010]

Love your videos...You should also consider making a 12 Volt 18650 battery pack for cars/boats and motorcycle with best available bms and some bms with remote Bluetooth monitoring! ( Weather proof) Iam sure there are so many cars and motorcycle restoration guys would love to see. Just saying. 👍

[@WesThatTechGuy]

These can be found on our website.

[@tracym427]

Voltages are a little off with Lipo/Li-ion. LiFepo4 works out better for car,boat, moto

[@maulanawahyudi7127]

Can I charge the batteries with BMS too ? or it just output

[@WesThatTechGuy]

Yes. Is both input and output terminals

[@Ziplock9000]

A few questions. What's the over and under voltage levels on this BMS? Does it actually do any balancing? Can you charge while a load is connected?

[@divikumar5475]

It got balancing resistor, it will take many cycles to balance

[@mefirst4266]

HELLO IT CAN NOT BALANCE AT ALL !!!!!!!!!!!!!!!!!!!!!@@divikumar5475

[@anandagaming2171]

What is the right BMS for 4s 10p battery pack ......cells are 18650 3200mah .....what is the current rating of bms ??

[@WesThatTechGuy]

We have several current ratings to choose from. 25a, 45a, 60a, 100a all the way to 300a, you can find all of my BMS's here: solargeni.com/balance-bms. Not sure if your 4s is Lifepo4 or Lithium-ion but we have both.

[@donaldsmith3048]

The music sometimes makes it hard to hear and understand you!

[@WesThatTechGuy]

sorry for this! It won't happen again!

[@WesThatTechGuy]

I have uploaded a new version of the video with the music turned way down. Just launched it yesterday.

[@dogbog99]

Autistic?

[@MaxMax-wy7bi]

So did I get it right that I can also use this BMS but with 3S2P?

[@WesThatTechGuy]

Yes you can. Any 3s config up to limitless Parallel

[@sreekumarUSA]

Thank you once again for the video. Some time back I requested a few info from you. Perhaps amidst the busy schedule you’d have overlooked, which is understandable. Here are the requests once again, kindly respond. 1) Do you sell PURE (99.6%) Nickel strips for 2P design through your AMAZON store? If so, please point to that link. If not please recommend a HONEST Vender who sells the same. 2) The Spot welding on those batteries look so perfect. I’m sure that welding machine must be a SUNKKO. What model is that and do you sell the same model, through your AMAZON store? FYI I use SUNKKO 788H that is so useless, that the welded Ni strip can be peeled off very easily. Any help from your side will be highly appreciated. Thanks and regards. Sree...

[@WesThatTechGuy]

sorry for the lost reply.heres a link for the 2p nickel strip: amzn.to/2GxxLXc Yes its a Sunkko 709A. Heres a link: amzn.to/2IjHBhf I have on SolarGeni.com Amazon store too.

[@maenikseu]

What is the recomended battery charger voltage for this type of power wall ? 12/24 v ?

[@WesThatTechGuy]

12v

[@maenikseu]

Thank you

[@WesThatTechGuy]

solargeni.com/battery-chargers/12.6v-3s-5a-lithium-battery-charger-tesla-power-wall-s120

[@raygilfillan]

an excellent straight to the point video with no distractions and presented by someone not trying to be a comedian, brilliant.

[@WesThatTechGuy]

Thanks

[@karoma7898]

Are you gonna pump 25A on that thin bare copper trace on the PCB? Won't it track? Aren't those solder joint gonna melt?

[@WesThatTechGuy]

Yes with no problems. I’ve been using this battery for a year or two now with no problems.

[@colinfshoell]

Where do you get your parts?

[@WesThatTechGuy]

the batteries from Samsung and we have the bms' made for us. you can get them on our website. solargeni.com

[@marshalltjones]

So I just built a 3S pack (only 3 cells). The cells each measure 3.5 V (new, but not fully charged). When I measure the cells in series, I get 10.5V (not fully charged). When I measure off the power leads, I get 7.8 V. Do I have a bad board, or do I just need to charge it? Kinda afraid to apply power to it .....

[@WesThatTechGuy]

are you using a balance BMS? is so you most likely connected the balance leads wrong.

[@keith1585]

Soldering looks a bit dodgy but still an awesome video.

[@RitikKedia2703]

Does the BMS take care of the cell balancing?

[@WesThatTechGuy]

Ritik Kedia yes

[@RitikKedia2703]

So I want to make a 24V battery for testing on am ebike for a week for so, then i want to make it a 36V battery so can I do that by changing the BMS and the motor?

[@isrofimakruf5326]

I made 3S 8P with BMS like that. How many volts is the maximum input of a good charger. Thnks

[@tabineshhtc]

12.6V 100% full so charger must be 12.6V

[@frankpitochelli6786]

What do you use this for, and, the soldering was less than desirable.!!

[@WesThatTechGuy]

everything I can. Mostly energy storage. This was a fast solder and iron wasn't as Hot as I'd of liked. It is much better now post video. Can't me a master of all trades you know.

[@bradmiller9993]

Ok dumb question: how do you figure 12.6 volts using a 3s configuration @3.7 volts each? I want to build a small 12v 18650 battery for my teardrop trailer with a solar panel on the roof; wouldn't 4s be better? Thanks!

[@WesThatTechGuy]

Nominal voltage is 11.1 V charge voltage is 12.6 V.

[@WesThatTechGuy]

Nominal voltage is 11.1 V charge voltage is 12.6 V.

[@WesThatTechGuy]

Nominal voltage is 11.1 V charge voltage is 12.6 V.

[@wimm1392]

Awesome video, getting on with the job, just plain simple to understand. Thanks for sharing

[@WesThatTechGuy]

You're welcome!

[@gmmrk35]

Can you guide me Should i use 1.2v batteries of 4300mah for battery pack

[@WesThatTechGuy]

I would use 3.7v 18650 or 3.2v lifepo4 myself. 1.2v cells are generally not for any type of high power usage they are used mostly for small solar lights etc. 1.2v is a usually a AA battery cell if memory serves.

[@paulhetherington3854]

And it's, upsidedown-- are you, blind-- deaf?

[@gmmrk35]

@naly Hwang right

[@raisagorbachov]

If you're using 18650s as a 10AH 12v battery pack on a solar charge controller system, do you still need a BMS?

[@WesThatTechGuy]

its best to use a BMS

[@raisagorbachov]

@@WesThatTechGuy Would it be better then to buy cells with BMS built in? That way a 20AH pack could be built easily

[@kotsios1234567]

The way you attached the power out wires was really disturbing for me!

[@WesThatTechGuy]

Any advice would be appreciated! Can you give me some pointers maybe?

[@kotsios1234567]

@@WesThatTechGuy It is just me! I am taking soldering wires as a bit of an art! But i would twist the wires before hand fill them up with good fresh solder then fill up the pads too and then just touch them on the pads and get them stuck round and nicelly on the bms!

[@kotsios1234567]

@@WesThatTechGuy basically fill up the wires with a good amount of solder and then put them on the bms! That would make a better placement and more secure too!

[@WesThatTechGuy]

Ya I filled them prior and soldered the board but they are pretty thick so they were a bit of a pain.

[@kotsios1234567]

@@WesThatTechGuy Working with such thick wires though requires a bit of a powerfull soldering iron since that thick wire dissipates the heat really fast. Dont know if that is the case with you.

[@damguru5625]

Wondering if I can get some help with a 4s 5p battery I have built. The BMS looks identical to the one in this video. I am charging at 17v 0.5amps and cant seem to engage the cuttoff. Not sure whats the highest point each cell could hit. On my last charge I had some hit 4.246 before I unplugged. Wondering if I'm ok to let it go ? or if I am charging it wrong... also the battery has a live load while its charging...not sure if that makes a difference. But its pulling minimal from the battery during the charge. Any help would be greatly appreciated. thanks

[@WesThatTechGuy]

DAM Guru I would try another bms. And make sure you have the proper charger

[@WesThatTechGuy]

17 V is too high for a 4s pack. Max is 16.8 V

[@damguru5625]

@@WesThatTechGuy ok I will give that ok....much appreciated

[@realtygeekph3656]

Whats the maximum number of batteries i can use for 1 BMS?

[@AndrewMurphy8383]

that depends on how many cells you going use i would say i would only use as many cells that bms is use for like 6s bms i would only use 6 18650s

[@richpagan2825]

Where did you get spot welder? Or did you make your own? Great video

[@WesThatTechGuy]

Got it on Amazon. Thanks

[@kusmanasafri1354]

Can two 12V battery packs in series become 24V and can batteries in series be charged with a voltage of 24V. Thanks.

[@WesThatTechGuy]

Yes They can.

[@jakesnake253]

I just started watching vids like this. I have no idea what the next step is though. I would really like to see what you do with it

[@captainyak3948]

I built mine from this video and I use it for my Kayak fish finder. It last a lot longer than lead acid + it's easy to carry around (doesn't weight much)

[@mmaboxingko4298]

Jake Shepard I am on the same page as you, i can’t find a full video to see if they add a USB port on it or a AC port or something so it can be used as a big power bank. I’m confused too

[@maxthepiguy3658]

Do you use the same wires to charge the batteries and to power a device? Could we have two plugs? One to charge and one to power the device?

[@WesThatTechGuy]

Yes it does. This is a common port BMS, You could add another positive wire to have 1 for load and 1 for charge so you don't have to unplug to charge. Or you can get a dual port BMS. 1 for charge and 1 for load.

[@cieloarauz8808]

Nice video but no explanation of battery connection positive/ - the average could get hurt not knowing what his soldering

[@chancewinsted3069]

How does the battery bank weigh that size?

[@WesThatTechGuy]

its just a few pounds. extremely light weight.

[@ecchstore2939]

You forgot the short circuit preventer rings to all of the batteries's positive side.

[@WesThatTechGuy]

This is not done on all battery builds. We now have them available and use them but in the past they were never used by any manufacturers that's what the BMS is for to help with issues.

[@rechiealvarez3985]

Sir i love this video.. I made also 3s battery.. But the input power is my problem.. Can i use input only 5v from the cellphone charger only..

[@WesThatTechGuy]

Thanks. No you must use a charger that is 12v li-ion. Max charger input 12.6v

[@rechiealvarez3985]

@@WesThatTechGuy thank u sir.. For answer my question.. Im pilipino.. But here in philipines.. But i love electronics... Because i want to put on the bluetooth speaker 12v amplifier..

[@grahamhardyvanlife5704]

You never said what size wire you used to attack to the bms board? I would hate to use wire to small and cause a fire :(

[@WesThatTechGuy]

I used 10g for this build as its a small pack with only an assumed 20a continuous discharge.

[@heenaagrawal8805]

Intro for headphone users be like: o____ o_____ ' _____o _____o Only legends will understand

[@mannymejia6689]

Can charger with solar panels???

[@WesThatTechGuy]

Yes

[@BigInjun05]

Could you explain how it is only 20ah and not more?

[@WesThatTechGuy]

Big Injun Big Injun it’s because each battery cell is 2.5 amp hours and there are eight in parallel making 20 amp hours

[@BigInjun05]

@@WesThatTechGuy brain fart on my end 🤣🤣

[@BigInjun05]

@@WesThatTechGuy the voltage would raise in series. But wouldn't amps go up in parallel

[@WesThatTechGuy]

@@BigInjun05 Exactly, hence the 12.6v (3s) and 20ah (8p).

[@BigInjun05]

@@WesThatTechGuyI was doing 8 in series and 3 in parallel. Drink more beer kids.

[@dankollars4501]

what is the max voltage you would use to charge this pack? 4.6? or will the bms let you use higher voltage?

[@WesThatTechGuy]

It’s a 3S battery pack so you would charge it to 12.6 V

[@dankollars4501]

@@WesThatTechGuy ya, thats what i meant is 12.6, dont know why i put 4.6. but does the balance board require you to charge with 12.6 or can you go a little higher? just not sure how the balance board works.

[@WesThatTechGuy]

@@dankollars4501 You never want to charge lithium batteries above 4.2 V per cell or in this case 12.6 V for 3S. Bms should shut it off before it goes over, that is the purpose of the bms. Never use a battery charger that is not specific to the voltage requirements of your pack you must use a lithium ion battery charger.

[@danmasaj]

You also charge from output ?

[@WesThatTechGuy]

yes

[@danmasaj]

@@WesThatTechGuy Thanks my friend for answer.

[@rabbu188]

Can the battery be charged using BMS or separate module is required for the charging? if yes can you make video/schematic diagram for the same , how to connect charging kit to BMS

[@WesThatTechGuy]

yes it can be charged using the BMS or can just be balance charged. I will upload a schematic on my site soon. sorry for the delay on this

[@byshasshop2097]

Can i use it for ups?

[@WesThatTechGuy]

Yes you can.

[@cody29092]

How do you charge it can you please show me 😢

[@timmothyburke]

Can these be put in series to make a 24 volt system?

[@WesThatTechGuy]

Tim Burke Yes they absolutely can.

[@alexsantana8260]

@@WesThatTechGuy How do we put multiple BMS is series? We are attempting to create a 48v system for an electric vehicle.

[@pauls5745]

what welder, and setting works best? those portable hand spot welders don't work out so well

[@nairityatarnekar6120]

Which Solder did you used for joining Nikel Stripes with cells...?

[@WesThatTechGuy]

the sunkko 709A

[@nairityatarnekar6120]

How much it Cost...

[@nairityatarnekar6120]

Can you send me a link to buy this Solder...

[@MrIcemaxx]

Hi what power suply you using for charging.

[@WesThatTechGuy]

I use the 3s, 12.6v Lithium battery charger from SolarGeni

[@garrettareiss]

How many Ah would that have of battery? I have a sealed lead acid that has 7Ah but kinda wanting more and have a bunch of these batteries around.

[@WesThatTechGuy]

20ah

[@TheSkyPod]

Where can I find the checkerboard nickel strips you used for the first part of the welding process ?

[@WesThatTechGuy]

you can get here: amzn.to/3cYBxIr and here: amzn.to/3d2uBtY

[@richardsiu5129]

Everyone is asking how to charge but I cant for the life of me find the correct charger. Can you please send a link of a charger I could attach directly. Thanks

[@WesThatTechGuy]

12.6v li-ion battery charger. Go to the link and choose one of the 3s lithium battery chargers solargeni.com/index.php?route=product/category&path=61_72_74

[@induvishwakarma8962]

How many charging voltage? Please answer me!

[@WesThatTechGuy]

12.6 V. You need a 3S lithium ion battery charger

[@carlosreyes6448]

How can you get 12.6v with only 3 in series?

[@WesThatTechGuy]

12.6v charged and 11.1v nominal. 4.2v x 3 = 12.6v

[@carlosreyes6448]

@@WesThatTechGuy so can you build the battery pack and charge it up all at 12.6v? Or do you have to charge the individual cells up to 4.2v. Before the build.

[@WesThatTechGuy]

@@carlosreyes6448 You can build a pack and charge them all to 12.6 V in a 3S pack as long as you use a Balance BMS. it is better if they are all at the same voltage before charging though. And they don’t have to be at 4.2 they can be at 3.7V we just want them all equal for best results.

[@carlosreyes6448]

@@WesThatTechGuy oh I see I really do appreciate your help.

[@Stampy36]

Wes, is it possible to make this solar charger ready? I can't find anything online

[@WesThatTechGuy]

Yes it is. do a amazon or ebay search for a lithium solar controller. Most solar controllers are programmable to match the li-ion voltage.

[@Stampy36]

@@WesThatTechGuy Wes, I'm building this now. Do I need a specific li-ion charger? Or it doesn't matter because of the bms?

[@1wldnczyguy]

I’m just learning. Does BMS stand for “battery management system?”

[@johnnyboy2459]

How do you charge this? can you just have any old 12v dc input into those 2 large red and black wires?

[@WesThatTechGuy]

12.6 V Constant current/constant voltage only

[@shankarneela]

@@WesThatTechGuy How many amps for charging...?

[@lilvirtt3577]

Does it change anything if I solder instead of spot welding?

[@WesThatTechGuy]

Nope not at all as long as you do it right.

[@marekkucer8094]

How much amper has it?

[@WesThatTechGuy]

200

[@pavithragurusamy6887]

Thanks for video 3.7v 10ah lithium polymer battery what BMS use 3s please tell me sir 12v 10ah

[@WesThatTechGuy]

You're welcome. Thanks for watching! You would make it half the size. 12 cells... 4p3s

[@JAF-jw9yb]

So IF you wanted to balance each cell individually you would have to make an intermediary circuit that could select each single cell during charging and then when done charging, recombine into the 3s 8p configuration for discharging? Curious as to why that might be overly cautious/unnecessary.

[@rty1955]

As far as I can tell the ONLY way to charge LiOn cells properly is to monitor EACH cell for temperature which will adnust the current (amps) to each cell. The voltage applied is also monitored. With simply a series/parallel conntection there is no way you can charge this pack correctly. If a cell goes bad it may explode, catch fire etc. Current draw from discharge should also be limited. Any over current draw can destroy a cell as well. Smh

[@karoma7898]

Are you the guy from ACDC?

[@WesThatTechGuy]

no

[@christophertilley4297]

Do you charge through the bms, or do you bypass it?

[@WesThatTechGuy]

Christopher Tilley yes. The positive and negative wires. you also discharge from there

[@christophertilley4297]

@@WesThatTechGuy Thank you for the reply. The reason I asked is a rather confusing youtube video suggested that charging through the bms won't supply the correct charging curve for the pack and you end up with an incompletely charged battery. He was using a raw power supply but didn't specify whether attaching a proper charger to the discharge/charge port would override that negative behavior.

[@francisraman4400]

Thanks for the great video! Do you think this wud b good to start a motorcycle ? will i need a cap? Thanks

[@ohiohamguy]

So how would you charge that pack?

[@WesThatTechGuy]

with this: solargeni.com/battery-chargers/12.6v-3s-5a-lithium-battery-charger-tesla-power-wall-s120

[@garyg9815]

what spot welder are you using? i tried 2 different once and they both suck.

[@nopochoclos]

Hello, some says put fuses between batteries but how? or solder cables or fuses as cables?

[@JohanDegraeveAanscharius]

You are not controlling the state of each cell, so you just make the same mistake everyone does. Once one or more individual cells give it up, your battery is gone, leaving good cells out of order. This means you are just copying the bad habits of before. You NEED control of each cell individually.

[@WesThatTechGuy]

Johan, this is NOT so. If 1 cells goes out in the series the others will still work just fine. 1 has nothing to do with the other. This really isnt any difference than individually fused cells. So not sure what you're saying? Thanks for watching!

[@jaredjones846]

Is there such thing as a 8s bms? 8s4p??

[@WesThatTechGuy]

jared jones yes we have them at SolarGeni

[@silversrayleigh8980]

Any reason you don't use copper to fasten these together ??

[@WesThatTechGuy]

not sure what you mean? the batteries or the bms or the charge/discharge wire or all of it.

[@silversrayleigh8980]

@@WesThatTechGuy Im honestly just curious why most people are using nickel strips and not using the more conductive copper ? I hear some saying that its more expensive.. BUT I've looked, and its pennies more, for , I'm assuming, less resistance. I think this is a great topic for discussion, what do you think sir ?

[@WesThatTechGuy]

totally understand you on this. Nickel is simple and fast as you can see and comes made proper for battery builds. It spot welds easy and fast. the wire is pre tinned copper silicone wire marine rated so the best on the wire. this is a simple easy to understand for the masses battery build. this is how these batteries have been built for decades now. Hope this helps. Any other questions please feel free to ask. Good topic of discussion!

[@silversrayleigh8980]

@@WesThatTechGuy So could you clarify, if one were to cut strips of copper and spot weld those strips to batteries in series or parallel they WOULD work more efficiently correct ? When priced on Amazon, the copper strips are $31.66 for a pack of 10. Which is way too expensive. HOWEVER a medium sized 'plate' of pure copper is 4 or 5 bucks... So this is the bases of my confusion. Do these 'strips' have other properties that make them more effective electrical connectors ?? It just seems silly to me, a DIY guy, maker guy NOT to use copper when the only problem, apparently, is the pre fabbed size of the strips. Its easy to cut 20 or so strips of copper.

[@WesThatTechGuy]

Copper is in fact the next best electrical conductor to SILVER. Silver is the BEST. So yes as long as there is no issues with spot welding copper to the specific battery cells type of metal tabs. I've always used nickel myself as this is the best method for the products readily available. Never used copper for this. Copper can be used as a sheet or even a small diameter pipe from the hardware store can smashed to make a buss bar and this could be a cheap method.

[@francisguchie1973]

very nice and simple video. I would like to do a 12volt 14ah pack how many cells do i need

[@WesThatTechGuy]

Thanks! 6p3s would be 15ah. 18 cells

[@richardward6747]

Could do with some description as to what a BMS is.. charger circuit thing? Input voltage?

[@WesThatTechGuy]

battery management system. 3s 12.6v charged. Used to protect the battery pack.

[@tiinpii]

Do you need to charge each cell full before solder it to the bms or just need same voltage each cell ?

[@WesThatTechGuy]

Tin Trinh Just need the voltage each cell

[@Estoyaca]

Hi there, thank you for the video. Is the red and black wire for charging or for output? If it is for charging then can you show how to connect for output? If it is for output, can you show how to connect cable for charging? The battery pack you just show only has one input or output. We always need both. Thank you!!!! I am just trying to fix my vacuum lol

[@davidrgilson]

The BMS only seems to be connected to the + and - of the array. How is it balance charging the block?

[@WesThatTechGuy]

it balances through the 4 + leads.

[@vickisabella130]

Love your video man trying to build a 36 volt 12 amp battery do you have any idea how to start do u have any diagram how to complete it and doing it for my scooter look a lot of video but could not figure it out half of this are cut out the main part of it the video Spell greatly appreciate your help thanks

[@WesThatTechGuy]

Thanks! I don't have one now per say but if you follow this build video and just do 10s its exactly the same. Just keep adding groups of cells so you have a 10s4-5p depending on the mah of the cells you use.

[@krishnagupta9667]

I had made a lithium ion battery pack rating 14.6v 30a with the same type of bms (30a).can I charge it with a 14.6v 3a smps or i need a same rated lithium battery charger.please reply fast

[@WesThatTechGuy]

Techno India You will need a 4S charger at 16.8 V. The 12.6 V charger will not charge the battery at all. 4s nominal is 14.8 V. Fully charged is 16.8 V

[@krishnagupta9667]

@@WesThatTechGuy can i charge it with a 16.8v 3a common smps

[@tangodigitalsystems]

So what you have here is 12V 20A Lithium battery pack, that's awesome!

[@kawo666]

Hello. There are some claiming that these BMSes are not very good for balancing the charging. Could you comment on how would you wire additional cables for balance charging with a charger like Imax B6? Thanks

[@WesThatTechGuy]

Ka Wo just solder to the positive to positive side of battery and the 2 other + wires to the other 2 + in the series and the 1 - wire to the negative side.

[@LIFEOFSTUFFEDANIMALS]

Since you did 8p would this battery have greater output amperage than one battery? 8x25amp=200amps?

[@WesThatTechGuy]

Yes exactly.

[@nikolaosberatlis3942]

I would like to make a 3S1P using 3 18650 batteries. The batteries are protected, do I need a PCB in this case?

[@WesThatTechGuy]

they will be ok with the protection board for discharge but not sure about charging them. those cells with the bms built in are not too reliable however.

[@roryoconnor7239]

What do you use to charge it?

[@WesThatTechGuy]

11.1v (12.8v charged) Li-ion charger. you can get one at SolarGeni.com

[@davieanwilliams9205]

@WesThatTechGuy whats the name of the bms you used in this video and do they have for higher volts i see so no smaller wires and want a simple bms same less wires is a good thng for me with high current out put any were from 250-350 help me if you can please reply thnkxs

[@noleftturnunstoned]

How are the balance leads attached? How do they keep each cell balanced? Have you tested the cells after a couple cycles?

[@WesThatTechGuy]

They are attached by a spot welder and Nickel strip as shown and explained in the video. So far so good they test out fine. Yes I test them over 20 times now.

[@noleftturnunstoned]

@@WesThatTechGuy I saw that you spot welded to B1 and B2, which I understand for 3s1p, but I don't understand how the cells in the parallel groups are balanced as well. Guess I just need to think about it some more.

[@fremaxter]

noleftturnunstoned parallel cells don’t need to be balanced because they are always the same voltage. If one would be higher, it would charge the other one. The bms has to balance only the voltage of the 3 parallel group in series.

[@aasound0217]

I am trying to make a 37v battery longer by connecting 20 18650 batteries lying down. Is this possible?

[@MaxGoddur]

Please help. Just completed my 14s4p battery pack my problem the BMS 14 lead wire harness is now too short to reach the cells monitoring voltage. Can you recommend the tools and parts purchase for building your own wire harness? Or better yet a 14 lead harness with leads at least 12 inches long.

[@87bcpalot]

If ever you attach a battery level indicator, where do you connect it?

[@WesThatTechGuy]

+ and -