How to build a DIY ebike battery from 18650 cells

[@EbikeSchool]

I hope you guys enjoyed this video. If you want to learn even more, I hope you'll consider checking out my Amazon #1 Bestselling book, DIY Lithium Batteries, available in paperback and ebook formats. a.co/iDtWdPX

[@cringmaster5986]

EbikeSchool.com can you just solder on the nickle to the batteries

[@iMiTREAL]

If you hotglue your cells doesnt get cooled really good and instead tear apart if one battery is faulty. Just think about that option.

[@jakestevens3788]

You r the man......thank you so much

[@hilobob15]

Thanks for your informative videos I just bought a SM8124A internal resistance meter. Many used 18650 cells read around 30 some around 100 or more and the levels seem stable. Many read a rapidly changing reading between 25 and 60 can you give us a video explaining proper expected readings.

[@cheepshotz]

EbikeSchool

[@brunobruno9307]

Friendly advice: Don't do it 4-5 times in a row. Check that video with thermal camera and comparison of spot welding and soldering. Even if you spot weld it gets some heat into the battery. It is better to spot weld once and then move to the next tab and do it in circles. This will give the battery chance to cool down a little bit.

[@themastereal8345]

the whole point of a spotwelder is that it stops the cell from even heating up in the first place, id only do what you said if I was soldering cells together

[@ProCoder119x]

​@@themastereal8345but still need to melt nickel And only till 60c heated cell but still I hope it's better to do like giving gap

[@miker8687]

nah, I worked in a factory spot welding on these exact cells for four years straight in college. You just work on one cell and move one, never in four years was there a problem due to what you're describing. Few small issues were when the strap touched or welded in the wrong spot...keep a bucket of sand near by and a fire suppressant.

[@rohanvija]

Hi, good content. I used to work for a company who manufactured battery Pack a good way to make sure the solder stays on nikel plate is to scratch it (nickel plate) with a blade, it helps solder stick better.

[@user-oe8xe4og6t]

Congratulations! you have been selected among my few giveaway winners,endeavour to reach out to claim prize....🎁

[@rohanvija]

@@user-oe8xe4og6t hi, thank you. Where do I contact you?

[@user-2uf2kr2c]

I use a piece of sandpaper or a dremel

[@lcrazyjeff]

dude. LOVE THIS! thank you so much. I want to build a custom electric scooter because everything on the market right now just isn't fast enough for what I want

[@thecow123xxx]

Learned more from this video than from 11 years of school

[@ronbrown8611]

where did you go to school

[@thecow123xxx]

Went to a school where I learned that question end with a question mark. You didn't learn that.

[@ronbrown8611]

+Tom Miller I grew up in Antarctica. I didn't learn that in the Icelands.

[@ronbrown8611]

Hi

[@ashtonbeattie8902]

Alex McRae The phrase "would have been" is proper grammar. The phrase "would of been" is not. It is common for people to confuse "would've", which is a contraction for "would have" for "would of", which is grammatically incorrect.

[@frozenprakash]

Power = Voltage x Current W = 3.7V x 20A W = 74 Energy = Voltage x Current x time W time = V x I x time W hour = 3.7V x [3000 mAh] W hour = 3.7V x 3 Ah Wh = 11.1 That simple. And for reference, 1000 Wh = 1 kWh [1 Electrical Unit], which is what our kWh energy meter uses in home ________________________________ mAh and Ah which are seriously flawed unit (which doesn't take voltage into account), which is normally used by manufacturers and marketers to misguide people !! Professional and universal unit for energy are, kWh or Wh. I mean, these all of us use kWh meter in home, kWh in Tesla car, and 1000 Wh = 1 kWh. (how else simple do you want ??) Still people use mAh and Ah, wonder how lame can they get !!! And for comparison (different rechargeable battery types): AAA [NiMH] = 1 Wh AA [NiMH] = 2.5 Wh AA [Li ion] = 3 Wh C [NiMH] = 5 Wh D [NiMH] = 10 Wh 18650 [Li ion] = 8 to 13 Wh (high drain to high capacity) 26650 [Li ion] = 14 to 18 Wh ______________________________ Average energy of Tesla battery are around 11 Wh [18650], and to make a Tesla P100D [100 kWh] Model S, = 100 kWh / 11 Wh = 100, 000 Wh / 11 Wh = 9091 batteries or in simple words, 9091 [18650 battery] x 11 Wh = 100,000 Wh = 100 kWh. ______________________________ So i would seriously recommend 18650 enthusiasts to use Wh and kWh [our universal unit] instead of flawed mAh and Ah which are way too childish unit for energy !!

[@jonassperlich7887]

Chandraprakash G f*ck Google, next time I'll ask you haha

[@UrBaNMCPaladinZ]

Thanks for the tip friend. I was searching for this

[@justiceifeme]

thanks for this

[@WHITELIONNYC]

You are the MAN!!! Thanks... 💪🏻🤓🤓🤓🤓🤓🤓🤓🤓🤓👍🏻

[@fseaijaz9960]

Thanks for your teachers research papers

[@kingerydev]

With all that insulation & shrink wrap, is there ever a problem with heat management of the cells? Will the cells heat up with fast discharge of fast charge? And how many charge cycles might you get. Excellent video! Thanks for posting.

[@EbikeSchool]

I've gotten tons of questions about where I got these materials. Everything can be found here: 18650 cells: goo.gl/tVjREI Nickel strip: goo.gl/VIrNQq Spot welder: goo.gl/cZS1yC BMS: goo.gl/S6gSQx Silicone wire: goo.gl/xmpbKD Black 18650 cell spacers: goo.gl/hQxWF6 Large heat shrink tubing: goo.gl/6v1ow9 Foam sheet for protecting battery: goo.gl/5e71tE

[@brendanoconnor4802]

Hi will these batteries work, i'm not sure because they are a lot cheaper than the other ones on ebay. www.ebay.com.au/itm/Brand-Tikon-3-7V-Rechargeable-18650-Li-ion-Lithium-Battery-Cell-Fr-Flashlight-OZ-/331328395337?var=&hash=item4d24b61849:m:mrpIJrj1oWd5miqvwQUBOXA

[@richiej6573]

Hi there , Great video I'm planning on building an Ebike and I was wondering if these are a decent battery www.alibaba.com/product-detail/Hot-sale-hight-quanlity-3-7V_60169974596.html?spm=a2700.7724838.0.0.mpG9Mi

[@EbikeSchool]

Pancake - No, I'm sorry but these aren't so good for ebike use. They cheaper chinese cells and are of questionable quality. These work fine for flashlights, but aren't appropriate for high power devices like ebikes.

[@richiej6573]

Thanks for the response but were you referring to the batteries I had listed or pancakes ? or both?

[@EbikeSchool]

Richie, sorry I thought I had tagged that. I was referring to Pancakes. Now I see yours. Those look like either knock offs of Samsung 26F cells (perfectly good but low power cells) or they are genuine but the vendor doesn't have the rights to sell them so they aren't showing the label with cell info. If they are knock offs then they are only as good as the average cheap chinese cell (not very good). If they are genuine, then they are just fine but you'll need to use enough in parallel to cover your current needs since they are low power cells rated for max 5A draw each.

[@0xXxSiFxXx0]

this is like magic, I loved ur work, the tools the tape the souder ..basicly every thing *--*

[@electronicshelpcare]

This laptop battery is the best quality, I also made one power bank by using the laptop battery.

[@richardb.1414]

Amazed about that table top spotwelder, wow

[@exgenica]

Just a suggestion to look into using 21700 cells instead of 18650 cells. You get a lot more potential for higher capacity in almost the same physical space...just an increase of 3mm Diameter and 5mm Length for *almost* 50% additional capacity. Put another way, a 21700 cell stores almost as much energy as 1.5 18650 cells of similar construction. Plus, the 18650 cells can have a lower lifetime than the same capacity 21700 cell due to increased stress on the 18650 cell when talking about very high capacity cells. Using 21700 cells may also let you go to fewer batteries in parallel for the same performance. For example, you may be able to use 3p12s instead of a 4p12s configuration. In the 12s configuration that eliminates 12 cells right there for actually a slight increase in mAh capacity. So differences in cost between similar quality 21700 and 18650 cells may become a non-issue in a given application.

[@anonymous175]

Thats rite

[@88ElevenShop]

That's some great content and production value. That kit looks great.

[@xxwookey]

Nicely done. Lots of useful detail from someone who's clearly done plenty of battery building before. I've been meaning to get a battery welder for a while now. Any particular reason to pick the 787A versus other hardware?

[@tipoyio]

Very nice video! I'm planning to make a electric bike and I found your channel! Really good videos! And you are good on explaining! Keep making!

[@ElGatoLoco698]

Ever try moving the spot weld electrodes a little closer together? Looks like they are too far apart causing minor issues.

[@dimik3855]

ElGattoLoco- agreed. It looks like he's got them set as close as this amazing machine can be set at. I would bend them a little closer.

[@bygross]

Hi dude! I really like your videos!!! But i have a question, why you use nickel strips instep of Cooper strips?? Hope you see this, thaksyou!!

[@GadgetAddict]

Great video. It was fun watching your spot welder!

[@mrochon01]

Very well presented, Now I can build my own. two thumbs up.

[@user-oe8xe4og6t]

Congratulations you have been selected among my few giveaway winners,endeavour to reach out to claim prize....🎁

[@hatulflezet]

Hi Mike, Could you do a video about the various BMS's, (smart BMS vs regular etc) and tips about what to consider when searching for one, you know, kind of guidelines for selecting the best one suited to the battery we build? תודה מראש! 😉

[@o1ecypher]

great invention

[@milodimich16]

From yours 100th explanation this only one proper and most important one.

[@oze-bikes4life663]

Another "great, informative and easy to understand Video" Thanks 😊👍🏼👌🏻 Used a few techniques I learnt from you from your Various "How To" Videos to build my own E-Bike (Mid Drive) & Battery Packs (15S /10P out of Sanyo18650GA Cells) for a Enduro E-Bike BBSHD Build

[@gaborboros9840]

Hi,You weld the batteries, but is it OK to solder the nickel strips?

[@marsbase3729]

my favorite new catch phrase, "let's get shrinking!" 😂 awesome video, thanks for the info

[@mgjr009]

This is an awesome informative video for building a battery pack. Especially for beginners like me. Will be checking out your book sir, such great content!

[@andrewmiller6202]

Hey, first off just have to say I've found your video's really informative! Love how they're organized and they've really helped clear up things. Just have a quick question for you: If you're building a 12v battery from the panasonic 18650 cells. Would you recommend using 3 cells for 11.1V? or 4 cells for 14.8V? I know the maximum capacity is 4.2v (which would give you 12.6v for 3) but I'm thinking I should use 4 because that way I wouldn't discharge the batteries as far. (keeping them "healthier") Am I right by going this route?

[@nobleharbor265]

Devices like radios connected to the battery in most vehicles experience a range of voltages. When the battery is charging the alternator maintains the system at about 14.5 volts. With the car off, the battery voltage is 12.6 (when full) At lower voltages, the current passing thru the connecting wires increases. Most devices perform better (cooler) at the higher ranges.

[@cesargrimm]

Im building an electric skateboard, and for ly battery the same cells are used so this made alot clear, it will be a 10s4p battery, :) verry good vid!!

[@places_unknown]

hay. what is 10s4p battery. can you explain please. i am confused here. also working on electric longboard. thanks

[@cesargrimm]

10 cells in series 4 in parallel, here he does 7 cells in series and 2 in parallel

[@ronbrown8611]

+Uneven Terrain you good

[@MrNigel1340]

Thank for an excellent video, this is the best battery build video I have seen yet, was building an electric bike using two bosch 36v three phase motors unfortunately it was fried when my garage went up in flames so will be starting again in a short while, regards Doc Cox

[@cali_gearguy5133]

Fantastic video, I've made a 13s 48volt pack without BMS and now I regret it, I can't find a 13S balance charger, I do have a imax b6 but I can only balance charge 6S. So I ended up just bulk charging and hoping my pack doesn't get too imbalanced until I install the BMS. Just a quick note on the pack you made, i'm sure it's because the pack was built on camera, but the balance line going into the BMS is not plugged in all way.

[@alexshepherd]

Cali_Gear Guy I noticed that too, really hope the plug was pushed in before all the foam and heat shrink went on... kinda adds suspense to the video doesn’t it, wondering if it will work :)

[@Rick-gs8pp]

Wow! This is an awesome video! One day when I'm feeling really ambitious I might try this!

[@tasoskoutlas9475]

Great video.You must make a video about the motors. I would like to make a bike to go at 50km/h... most for the hills...but it is so many the motors in the market and I don't know exactly what is important when I compare two motors. First I choose the motor and upon this, I build my battery or the reverse?

[@aaryjan]

To get the best results: as not all cells are created equally & there is likely always small differences in the top village they reach, you should measure a bunch and try to line them up in two rows (in this case) of seven in such a way that both the two rows will show about the same Voltage and then ONLY connect the two rows at the outer polarities (as opposed to, connecting them in pairs of two's all the way). It will minimale the indecency inbetween doubles and on, wherein unequal pairs and so on will drain percents of each other (and be probably only less than 70% efficient in that) from the highest to the lowest of each pair in order to them trying to keep evening out. Connecting two rows of seven apart from each other that way and only doubling up at front and end may save you a few percents of loss after charging.

[@jackdampier9520]

your post is poorly written and therefore difficult to understand.

[@08kayak21]

Really nice video! I have a MagicShine MJ868 lamp with no battery and would like to do one my self. Is this how i do it or should i use somthing else? The original battery is 4×18650 SAMSUNG Li-ion battery (7.4V 5.6AH)

[@luciferknight8224]

would be good to show how to make a charger for home designed battery packs

[@DmitriNesteruk]

Why make you own when you can buy a good one? You only need to do it once. Cycle Satiator is good.

[@johncapewell9480]

Why do you have parallel battery connections? Is it to obtain the AH charge? What is the AH you are trying to achieve ?

[@pederb82]

Dude, where did you learn to solder? Not one was up to even Ok!

[@rogercrier]

I will second that comment! They are probably good enough to work, but definitely made using a flawed technique. Sorry to be negative :o)

[@Splinter4077]

Thank god it wasn't just me that noticed that. It's almost painful to watch

[@ALSANMAT]

This vid i think was more on how the cells and bms are connected than technique. If you noticed those cells have marks from previous welds before he put the pack together

[@Splinter4077]

Yeah it was only the wire soldering portion haha

[@ALSANMAT]

Tech Talk soldering heats up the cells significantly. Lithium cells don't like getting hot.

[@CrossfitCarlos]

this channel is so awesome

[@jamesmk2003]

Brilliant. Where can I lend this welding machine? In a library?

[@Deemon1]

easy to find on aliexpress or ebay. also you can do it yourself, search on KZbin - battery solder from microwave oven

[@jamesmk2003]

Thanks.

[@EbikeSchool]

This is where I got my spot welder goo.gl/cZS1yC

[@arad4912]

EbikeSchool.com not available anylonger

[@dalysea26]

AR AD I got mine at m.aliexpress.com/item/1688174875.html on sale for $180, but I haven't actually used it yet.

[@prigfop]

i always use white as the positive and black as negative. its less confusung

[@eksine]

I wish you could explain why you have a backwards 1/4" phono plug and a negative wire soldered to the outside of it. I'm not familiar with this connector, but to me it looks like a music plug soldered backwards. Also I've done basic soldering and when you are soldering those wires from the BMS to the nickel strips you will notice it is beading off the strip like water droplets on glass. If you tug at those connections they should come off easy, you're supposed to either use fine sandpaper to rough up the surface or flux. any time I've seen solder look like it's beading off something and it looks like it's having a hard time sticking it means poor adhesion

[@EbikeSchool]

Hi Bruce, what you are seeing is a property of solder known as "wetting", where the solder spreads out when it reaches a certain temperature and adheres to the nickel. It might be hard to see because I sped up the video during the soldering, but rest assured all of those joints were tested and are quite strong. Regarding the RCA plug, it's only a "music plug" if you've got music going through it. Otherwise it's a generic electrical connector. These are gold plated RCA connectors that can handle up to 5A. Other RCA connectors can carry up to 15A. The outside of the barrel on the mono end is negative and the tip of the barrel is positive. This correlates with a standard in the ebike industry for using the center of RCA connectors as positive.

[@eksine]

EbikeSchool.com very interesting, thanks!

[@adonisbernal2637]

@@EbikeSchoolwhat is the recommended charger for this battery pack?

[@Kenandlizabeehaven]

well put together video even an old guy like me understands what you're talking about love to know how many of these cells it would take to make a 100 ah Pak I would like to put together for an electric boat thanks for your response

[@JarppaGuru]

macgyver would use duck tape

[@massimogioia4422]

wrong! Just bread and water. Perhaps some milk as well

[@MrGollum1996]

JarppaGuru an egg, 2 batteries, a wire and some ice cubes. But the problem: it would explode

[@fivespeed3026]

JarppaGuru You forgot about the paperclip.

[@OldCharlieRum1903]

JarppaGur

[@danielaneagu5545]

hello! What should I change for an electric bicycle battery (36V 9Ah) that no longer charges at all? I specify that the charger is ok. Are the cells the problem or the BMS!? Thank you for your answer!

[@filip3148]

you should make more videos. this is incredibly helpful to people!

[@EbikeSchool]

Thanks! I've got a few more coming, don't worry!

[@tamirdahari8041]

Please do a video on how to build a 36v 12a thx bro

[@EbikeSchool]

I've got a video upcoming where I increase the voltage of a 24V 20AH battery to 36V 20AH by adding cells, hopefully that will be helpful for you!

[@filip3148]

Keep em coming! :)

[@harikumaryottec9576]

Please provide how much current can carry with that nickel sheet. Thanks in advance.

[@wedding_photography]

Please get yourself a good microphone and the lights that don't flicker. Turn off all the auto-settings on your camera, so the brightness doesn't go up and down, the color balance doesn't go from warm to cold (like at 1:00).

[@xdmin67]

Just enjoy the free content, since then humans started bitching around everything?

[@thereisnotube]

awasome but how else can we do it without electric welding machine?

[@angelhd7446]

Can you teach us how to make a 48 volt battery pack?

[@trustinjesus1119]

Ebike School has a video: DIY 52v 10.5ah lithium battery from a kit Before I noticed that one I saw this video (off to the right) from Rinoa super genius: DIY 52v (48v) 16AH Lithium ion 18650 ... It's so funny because I have a 29" bike I'm having a hard time finding ebike supplies for and just last night I noticed 29"/700c as if it's the same thing and then I saw 28"/700c. Gotta love it. Neobattery is the place to get the batteries from $5 in lots of 40 or 100, they're on eBay and probably have their own site.

[@angelhd7446]

TrustInJesus111 I have 18650 batteries that I took apart from old laptop batteries. I am not 100 percent sure how to make a 48 volt 10 amp hour pack. I have soldering stuff, and spot welder just don't understand the series and parallel yet and how to get 48 volts. Lol

[@memorablename5187]

you just add more cells dude

[@soilworkdc]

26:42

[@Wuety06]

Can u do simple division and round up? 48/3.7

[@donovanh24]

really clear video, the best I've seen. thanks

[@NonnofYobiznes]

I was going to ask a question, but apparently you aren't answering them. You only want people to go to your website to ask. Isn't it easier for us to ask here? Anyway, since you're not answering, nvm. Btw, what strikes me is that your using an expensive thing like a spot welder, but you're not using spacers to keep the batteries better ventilated.

[@sometuber6856]

Hmm, good point. People don't waste your time, he doesn't care about your questions. Moving on.

[@ronbrown8611]

he answers some questions what's your question? you might be able to find an online forum to answer your question

[@bigcatsliontiger]

My ebike battery 48V 10.4A after 10 month use fully changed for 3.5 hours , while at first for 5 hours ? Is it demaged ?! Aslo when i ride ebike shut down while bike screen shows 2 battery bars left from 5. But still my range is 30km as at first ?!

[@mikemordkovich7653]

Hello, I have two questions/comments... 1. The parallel connection of the such high current (means very low internal impedance) cells looks "dangerous" to me. If there is any "unbalance" in internal impedance between the parallel connected cells, it will be internal current trying to compensate for this "unbalance". 2. When you check the voltages of each cell, prior to put them together, I would recommend to do it under a DC load, maybe not full load, but at least, say 1 A, for this cell capacity. That will allow you to initially group the cells, connected in parallel. What do you think?

[@edgeueke8357]

Like the Vruze 2.1 kit. Ed

[@alxrs1]

I think that with plastic spacers you can put 2 fans front and back, blow and suck, so it can cool down the batteries. :)

[@samprat3927]

Should i trust buying prebuilt battery packs from amazon? Looking into 72v 20-30ah batteries. Where do you recommend i shop for pre built batteries online? Preferably USA fast shipping

[@maheshkafle]

Where to buy good quality battery ?

[@laptopbatteryteardownother5640]

I've seen some guys solder the batteries together with soldering acid. It seems quite faster than the usual soldering. Do you think this might work as well?

[@DivineStatus]

I want to make battery pack for motor having 48 Rated voltage and 92 Amp continously current by using samung 18650 -30 Q cell ( 4.2 v max volt, 3.6 nominal voltage , 3000 mAh , 15 Amp continously discharge current ) 11S6P Or 12S6P Or 11S30P Or 12S30P . Which one is correct please let me know Thank you

[@zeffur7]

Good video, but, I'm wondering: *Wouldn't it be much better/easier to:* A. Place 7 cells + up (parallel row 1) B. Place 7 cells - up (parallel row 2) C. Hot glue the cells together D. Spotweld a nickle strip to each + cell in row 1 E. Spotweld a nickle strip to each - cell in row 2 F. Spotweld a bridging strip from the + row to the - row (as many or as few strips as you want to handle the estimate max current flow to connect parallel rows in series with each other. G. Connect your power leads to the + & - sides of the battery appropriately *The arrangement that you chose seems overly complicated. Is there some advantage doing it that way?* Thanks for sharing!

[@EbikeSchool]

Yes, your way makes a 7.4V battery. This is a 25.9V battery. To learn more about the difference between series and parallel wiring, you might like my book on battery building: a.co/ibnVGz9

[@zeffur7]

Oops... my error.. it was getting late. What I should have typed was 2 row of 7 cells that alternate + & - every other cell that are then each spotwelded together with one nickle strip to create 2 series-connected batteries & the rows (or banks) are then bridged (as describe above in my previous comment) to create parallel- connected banks for additional battery capacity.

[@jasonsuggs111]

Would it be ok to hot glue the nickel in place before welding it on so it doesn't move?

[@rfenchel]

Oops...just clicked show more...and voila you listed BMS source. Thank you! Ryan

[@furulevi]

Almost nobody is using soldering paste, thus the soldering iron needs to be in contact with the metal for a longer period...

[@hotfreshrider]

furulevi * *Internet award for most useless comment goes to, you!* * Lol, jk ;)

[@furulevi]

thanks for the award, but with a quality soldering paste is still better :))

[@pigeontransilvania4741]

hello..I need a tip..for 55.5v 20.8ah what bms I need..3,7v batteries 2600mah. 15S-8P .. I want to order on Aliexpress ... thanks

[@alireza071]

Hi if I use 6 sumsung 40t in parallel the discharge will be around 180amp, will I be able to use 100amp bms for the pack? Does 0.20mm pure nickel good enough or I should use 2 lier of it thanks by the way pack is 20s 6p

[@mds1986ms]

Personally i would go with the headway LiFeP04 cells before 18650 but thats just me jib jabbin.

[@emmanuelnashville2828]

I have a bms with 20amps and I want to increase my battery capacity from 10a to 20amps. Using cells with 3.4ah the capacity with be 20.4. would like to know if it will be safe using such capacity 20.4a on a bms with 20a.

[@DivergentDroid]

I'm No good with an iron - But.. seeing this video gives me an idea to solve that - Why not make a battery enclosure with contact points that will do the work instead of soldering? .. Simply pop the batteries in and Poof.. battery made. Thats what I want.

[@wesleyoh4033]

Hi, can I know what is the main difference in a BMS with the C- and a BMS without the C- for the negative charging wire. Not the way in wiring the BMS but in terms of application wise. Any difference or just how the BMS is design.

[@wimm1392]

Thanks so much for sharing, you got me to built my Power wall. Thanks

[@dado304]

Hello Sir. Nice video, like your ebike school project. Have a question. I have cheap Sunkko welder. I am able to weld nickel strip to battery prety strong, but can not then weld nickel to nickel. It is very loose. Same when trying to weld two nickel strips without battery. When I added current I melted bottom strip. Anyway, dont you know what 4P, 6P, 8P means? I can combine it so I suppose 4P and 6P on will give me 10P. What setting you use usually. Thanks a lot.

[@EbikeSchool]

I'm using a double pulse at with the welder set to 40. That's very odd about melting the lower nickel. I recommend trying to lower your current and see if that helps. Otherwise it might be a defect in your welder.

[@hersheykiss9500]

what would the current limit be if you simply maintained compression between 2 cells?

[@vishwambharjoshi4317]

Please tell me BMS connection

[@christopherblomeley6925]

Hi Mika. I have two of your books. I'm now ready to order my first batch iof 18650's can you point me in the direction of a supply of good quality 18650's please...

[@user-oe8xe4og6t]

Congratulations! you have been selected among my few giveaway winners,endeavour to reach out to claim prize.......🎁

[@MCA2A]

Would button top batteries work for a battery pack build and is there really a difference? Also, will battery kits purchased from VRUZEND work for these button tops as well? Thank you.

[@atahghighi]

Thanks for the video, Question , where can I buy large number of batteries for less price?

[@kimnielsenthewordyvikingett159]

I wish somebody would show same thing with 2650s. Same amount of batteries but laid flat 7+7. Question wouldn't it be same power but last longer?

[@user-oe8xe4og6t]

Congratulations! you have been selected among my few giveaway winners,endeavour to reach out to claim prize.......🎁

[@aathityavikash1369]

Will increasing the Ah by replacing the battery but keeping the voltage same , cause damage to my e bike's controller and motor ?

[@zoheb4you2002]

What is the output voltage after full charge 25 volt..?

[@antoniogalluccio4213]

What does it happen if you make more connection in series and then you connect in parallel only the main + and - of the whole series instead of putting in parallel every single cell? Does it work or not?

[@juangoveamunoz4095]

what about the black spacers? when do you recommend to use it? it depends on the quantity of cells?

[@arturovivas4491]

Hello, I'd like to start by thanking you for your videos. I want to build a vertical battery with 18650 cells for a 500W/48V or 350W/36V scooter motor. do you know what kent of cells distribution and how many cells I need to use?

[@KirkHMiller]

These diagrams are helpful for when the dyslexia kicks in!

[@mop864]

I've enjoyed all your videos and have been learning a lot Thanks!! I wanted your opinion on what kit would be best for me im 235 lb 6'4" and already commute 17 miles by car then 8 miles by bike most days without electricity but would love to make the whole trip by bike I originally was think 52v 20ah bafang hd on my current aluminum novara buzz + 9 speed with hydraulic discs but am worried about the chain/gears/rear frame strength because of the thin tubes in back. I have some steep hills in my commute thats why I originally thought mid drive but I remember you've had both drives before so would love you opinion or thoughts mid drive or hub maybe new stronger bike

[@FIGUEIRINHA]

some BMS have only 2 wires for charge and discharge. some have 3, for 1 charge, 1 discharge and 1 common. in the electric bike you never charge and discharge at the same time. but using offgrid solar to charge (sollar pannel + dc converter cv cc) charge and discharge happen in the day using it. if you have more info about the, please show it! I wanna remove my old "car style" lead acid batteries with solar charge controller to the better way and as far as know li-ion don't need the charge controller. just the PV and the dc converter cc cv (maybe step up and down) to feed the BMS and charge it all. I guess 7s and maybe 10 or more parallel are the better choice for solar 24V lead acid replacement but I don't really know how many amps I can feed in the pack. the PV must match the max amp feed rate of the batteries. any help are really welcome

[@geraldfrank1630]

Full price & break down? 🙏

[@jelmervanderspek2366]

Hi, im wondering why would you use 3 nickelstrip connections from the 3 parallel cells to the next for the serie connection? Is this also possible with one connection for possitive and negative?

[@jelmervanderspek2366]

i mean 2 nickelstrip connections

[@MikeBeard]

A 20a bms is all that is necessary? Seems like an ebike would draw more than 20amps. Let me know if I am incorrect :)

[@princewindyawiri9410]

Or how can I get all these materials?

[@Ilmumotorbensindanlistrik]

Best explanation about make custom batere, i'm newbie, my i ask? why we make custom batere? why wenot by new pack batere with same spesification at pabrican?

[@gwernette5971]

Would have been nice to see your build in an e-scooter.

[@daylankp1]

Which charger would you use for this battery?

[@miloraddimic1711]

■■■ This is the best world example ■■■ ■■■ You surprise me ■■■ ■■■ After long-long time ■■■

[@pbrown6734]

what type of BMS?7S2P?

[@javieruriel]

Do we need a balance for those packs? I already have your book nice book by the way.

[@EbikeSchool]

You should balance the pack, yes. This can be done either by a BMS installed in the battery, or an external balancing charger.

[@doit_vehicles]

from where did you get those black and red discharge conectors ?

[@nicoletsui9857]

Hi Do it , please email to [e-mail] , she will help you .

[@nicoletsui9857]

The discharge connector is Anderson

[@1937Brett]

do you build battries so you can post them? i also am woundering can you help me sort out my eletric scooter i am wanting to make it faster also aswell thanks

[@TheGreenOps]

Hey, I was wondering if anybody could give some advice, I may potentially need to build a battery to replace the one in a Seabob F7, the current battery states, 2.1 KW/h, 56v, 40ah.. would this be possible to make from 18650 cells and would I be able to use the original BMS from the old battery pack with the new 18650 cells once they’re wired together? The old batteries were accumulator battery’s, I’m unsure what this means or if it matters? Also apparently the previous battery was 14 lithium cells, does this matter? Thanks :)

[@Professorvapes]

Hi I have a 24volt 5amp battery on my bike could I use this method?????

[@gretaproperty]

whats the name of your soldering ?