Building a DIY eBike battery with recycled Samsung INR21700-40T

Building this ebike battery from recycled Samsung INR21700-40T cells was just the start of a new hobby - building the smaller more complex ebike batteries turned out to be quite enjoyable. I'll be putting an extra layer of 0.15mm nickel onto the battery to help future proof the battery. It's intended draw will be 50 amps max, but you know how it goes MORE SPEED! or MORE POWER is always needed.
⚡Batteries - bit.ly/2CA7aVl
⚡Cell Holders - bit.ly/33EGI8V
⚡SpotWelder - bit.ly/2OhVCM9
⚡Spotwelder Battery - ebay.to/2lAJyLh
⚡Nickel Strip - ebay.to/33HUSpN
⚡OPUS BT-C3100 Charge/Discharger bit.ly/33Sf8Fe
⚡BMS - ebay.to/2QokSBQ
If you read this far I'd love a comment or a 👍
🔋🔌RePackr - Cell Pack Builder🔌🔋
🔋secondlifestorage.com/repackr...
💰Save up to 10% at these stores with coupon code ' powerwalls '💰
🔵 BatteryHookup USA - bit.ly/BatteryHookUP
🔵 BigBattery USA - bit.ly/BIGBattery
🔵 Lithium Power - Australia - bit.ly/LithiumPowerAustralia
Second Life Storage Cell Finder -
🔋 Paolo Italy ebay.to/38xPUhT
🔋 Tim De Groot NL ebay.to/2OX9koS
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💻💡DIYPowerwalls Community Facebook Group 💡💻
► / diypowerwalls
Official forum thread with all the extra details to fill all the gaps -
👍 Total Project Cost - goo.gl/cfLqZf
👍 18650 wall mounts - goo.gl/xDUzSV
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Cheap BMS - s.click.aliexpress.com/e/eX4NpXsc
Quality BMS - www.batrium.com
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Learning resources -
🔖 DIY Lithium Batteries- amzn.to/2MC4BaM
🔖 Mobile Solar Power Made Easy - amzn.to/2Tzk6TA
🔖 DIY Solar Power - amzn.to/2IgxfMa
Recommended Gear -
🔵 Clamp AMP Tester -- goo.gl/z8b4uJ
🔵 iCharger X6 - goo.gl/GtBtW9
🔵 Flir Thermal Camera - bit.ly/35qWwgh
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Thanks for tuning in as always!
Pete
#ebikebattery #21700 #HBPowerwall #DIYPowerwalls

[@jameswilliamson1312]

You've done well on the new studio Pete. That is a lot of footage to edit. It's easy to underestimate the time it takes to put a pack together! Love the work mate.

[@HBPowerwall]

I've asked for help on the next one from a mate, just to see if i can cut down the film / edit time. Can't wait to see what i can build next :)

[@midori8735]

Nice battery pack! The high capacity of the 21700's combined with the efficient shape of the pack makes for a very satisfying build! Look forward to the guide on using repackr

[@HBPowerwall]

Thanks Mi, I think the rpackr one will be great if i can nail it with out tripping over my self lol

[@RaithUK]

@@HBPowerwall Im sure youl do fine mate, just take a deep breath and don't try and rush it.

[@goldenrayimageneering5930]

I want to create an electric scooter and bike. Can you provide me with your email id?

[@durrance008]

Great video! I can't find info on where to harvest these cells from. Does anyone know which manufacturer(s) are using them in packs?

[@raul7293]

AWESOME! That's what I was looking for. Thank you very much

[@HBPowerwall]

You're welcome!

[@JAG9100]

Great work, very professional video. I like the new workspace. keep it up!

[@HBPowerwall]

Thanks buddy..its nicer to work having more space that's for sure

[@JAG9100]

@@HBPowerwall I'm still working on my shed. 9ft x 9ft. Have to raise the roof to make it easier, since I'm 6'6". Then I'm installing false walls and insulation. Looking into a battery box or at least something to cover them up a bit more

[@HBPowerwall]

I used to think having as much stuff in here as possilbe was a good thing. Now my thinking has changed a little. It's cheaper to buy a new part than look for the old junk that might save a dollar but cost 2 in time!

[@monstercolorfunco4391]

one nickel strip looks like 5A so 5 is 25A, only need to double the ones going from one group to another, the ones that form parallel links are ok at 5A, as far as i know.

[@HBPowerwall]

Doubled all of the just to be sure..

[@Daraghfly]

Its BATMAN! Great video, good job, thanks.

[@HBPowerwall]

Thanks for tuning in Daragh!

[@toochi84]

Great Vid Pete

[@HBPowerwall]

Thanks Keith from www.18650shrink.com :P

[@DavidPozEnergy]

I loved how you edited at 5:06 Nice.

[@HBPowerwall]

Looks cool terrible to record and edit out lol

[@RaithUK]

Talk about fantastic production quality dude thats a huge difference to the usual videos.. you going Pro on us ? lol Nicely done Sir.

[@HBPowerwall]

Trying to do better :) won't always happen lol

[@RaithUK]

@@HBPowerwall The effort is not going un-noticed mate, and its not required.. just a nice to have :).

[@HBPowerwall]

Thanks for feedback bud - does put a smile on my face knowing i'm heading in the right direction

[@toekangbaterai9869]

Thanks for vid, nice set up

[@HBPowerwall]

Thanks for tuning in

[@ahaveland]

Nice work Pete, though I think you'll need a bit more beef where the entire pack current goes through just two nickel strips even if doubled up. The inter-parallel connections are fine, but the series connections would benefit by adding copper bars/strips/wire to them. Anyway, look forward to you testing it at 50 amps with the FLIR camera!

[@HBPowerwall]

I'm sad you didn't watch till then end :) I'll be doubling up the busbars in next video & adding the BMS Unfortuntally I don't have a way of testing load at this point unless i put it on one of my pips or NOW i think about it i could use my 48v to 12v DC to DC converter.. food for thought

[@ahaveland]

@@HBPowerwall I did watch to the end Pete, just think that 50A through 2 x 2 strips is a bit much, but I would be happy if you can test it and measure the voltage sag across the pack, and across individual strips as well as temps.

[@HBPowerwall]

That would be a great test i'll see if there is time before it heads to its forever home. Thanks for watching to the end :)

[@alireza071]

thanks mate great vid isit possible to build the 20s pack of 120x Samsung 40t and 40xsamsung 30t isit ok to mix them they are all new cells?

[@MrDenisJoshua]

Great work :-)

[@HBPowerwall]

Thank-You

[@KillaDukeBadMan]

Nice, very tidy.

[@HBPowerwall]

Thanks, David

[@dennisyoung4631]

Plan to get Kweld as soon as I can...

[@minjiguan3248]

amazing!

[@HBPowerwall]

Thanks!

[@adamjensen7870]

Cool!

[@HBPowerwall]

I totally agree Adam

[@KeatonsCarlott]

Whefe can i search for used 21700 batts?

[@startcherif]

Very nice video

[@HBPowerwall]

Thank-You

[@Chooseyouruniquehandlebyaddin]

a more efficient way is to CTRL+F and input a cell number, it will show you which group to place them in.

[@HBPowerwall]

Nice thanks for the heads up

[@izzzzzz6]

Did you beef up the series connections? You can draw 35A from a 40T so 5p can try to put 175A through the series strips, (if you had a machine that could demand that much power). If you put a biggish load on the battery for 5 mins or so and feel with you hands the series connections to see if they are getting warm, if they are then you will be loosing power here.

[@marlonbramble2485]

Great video. Where did you get the spot welder? It looks like one of you DIY projects. I would love to get one

[@cameronhli9639]

kWeld . Search it on KZbin.

[@HBPowerwall]

All the details are available here - secondlifestorage.com/showthread.php?tid=8301&pid=56972#pid56972

[@retrograde330]

How many amp hours is this? And what’s the voltage?

[@twotone3070]

Nice edit.

[@HBPowerwall]

Thank, i have to agree I loved this one also

[@joblessalex]

They're crazy. That'll do 50A no problem lol. I have my bike pulling 100a with that config.

[@njfulwider5]

That’s what I thought also! Be interested in knowing why they said it wouldn’t?

[@HBPowerwall]

but will it do 150amps the cells are max rated for :) better to be safe than sorry

[@ThanosSustainable]

When doing 50A over these nickel strips, they're gonna get hot. That's why you should be adding paper rings over the positive pole of the cells, to thermally protect the wrap of the cell and the original ring that's in there.

[@ThanosSustainable]

@@HBPowerwall add extra nickel to the connections that actually pass the current between each S module.

[@hansdampf1968]

@@ThanosSustainable good advice, I will save that for later

[@mwint1982]

I can't wrap my head around those connections lol what a maze...a-maze-ing

[@mwint1982]

Guess it would make more sense if I could see both sides at once

[@HBPowerwall]

Imagine a snake - head is positive, tail is negative - it's all nose to tail so the current flows around the battery so to speak but yes seeing both sides probably would help a lot

[@mwint1982]

@@HBPowerwall I've never actually seen series-parallel in action if that's what this is?

[@mwint1982]

See...I thought you could only parallel the "ends" after putting everything in series. I never thought about parallel connections every step of the way. Seems to make more sense for current flow ;)

[@nickgalena1]

I often see - plus and minus pole of the batterie - needs a double layer or a thicker nickel strip. Because i am building my second ebike batterie with 0,2 mm pure nickel strips it would be nice if you could inform about that.

[@HBPowerwall]

I've been told i need to double up - that's all i know sorry

[@njfulwider5]

I’m in the middle of a triangle battery also! Just curious what amp draw you’ll be needing and why they said it would give you what you need with a single layer of nickel strip. Great video 👍👍👍👍

[@HBPowerwall]

The intended max draw is 50amps, but need to future proof it a little so going to double up on the nickel today/tomorow

[@njfulwider5]

@@HBPowerwall Holy Cow! How many watt e-bikes does he have? I have a 1500watt and I only need a little under 30amps at 14S. The reason I was asking, I just wanted to make sure I didn't need to add extra nickel strip to mine also.

[@davey2k12]

@@njfulwider5 I'd add copper for that current but his spot welder no good for it need to flatten copper with hammer 👍🙂 and melt it to ribbon but I used solder lol 👍 if it came loose could cause a short tho 😂

[@lofi-chillstep]

How do i go about learning this trade industry? Id like to educate myself on how to properly put together cells and ratings

[@HBPowerwall]

No idea, i googled every thing i've done lol

[@domodomo5943]

Tool batteries are Milwaukee m18 12ah

[@HBPowerwall]

👍

[@timmothyburke]

What do you think of using the 21 700 sells for a battery power wall. I’m thinking of the latest version that they’re using in the model three . I’m just about to buy some new ones for a power wall

[@HBPowerwall]

well these cells are good for burst of 30amps so you'd get away with a smaller wall size if needed. But the cells would last a long long time if they only had 0.5 amp draw

[@zachniedfeldt]

The 21700 is a great choice for power wall, considering thats what the new ones from tesla use (not sure if they are using them in the cars yet). The 40T is quite a bit more current than you probably need and it comes at a slight trade off of capacity. Look at the samsung 50E 9.8amp, 5Ah.

[@user-ni3wq1kr6d]

Hello Arrived charged you 4 batteries 21700 simultaneously on the 4 ports? It seems to me that on the opus BT-C3100 v2.2 this configuration seems correct considering your video that shows it Is there a space between the accumulators that avoids contacts between them in this configuration? Thank you for your video Thank you for your reply

[@alexh8754]

what reply are you thanking him for ?

[@pageseven1792]

I'm still confused on pack building with / without cell-level fuses. You didn't use any for this build. Are the fuses only for powerwalls or electric vehicles?

[@HBPowerwall]

Ebike, medical, laptops etc all don't use fuses - Tesla does, must be a reason for that :)

[@WeillandVicenteFarias-xx9hn]

I have a 48v and 28.8 ah battery, I've been using it for 17 days, but yesterday it didn't turn on, when I put it on the charger the panel turns on and shows 100% charged, without the charger the panel doesn't turn on, the battery doesn't pass energy to the electric bike, can you tell me what the problem is?

[@zuluwars2996]

Can I suggest using Tony Vortecks vbms for this ebike battery his been doing high powered ebike setups for a considerable period of time. Very clean looking battery and something along the lines of what I hope to make at some stage.

[@HBPowerwall]

I'll look into it for sure

[@gym_buddies9504]

sir I wanna buy that spot welder you have. how can I get it and how much

[@HBPowerwall]

www.secondlifestorage.com/kweld

[@marcelopepito51]

sir .. what if i build 12 volts 100 ah battery pack it is necessary having a fuses even if it is only a 100 ah?plss answer..

[@HBPowerwall]

Always fuse if you can and it's practical

[@herenow2895]

What happened to the rest of this build ? Have you finished it yet ? I cant find any more videos about it.

[@HBPowerwall]

It's gone back to it's owner and i havn't had an update as yet

[@herenow2895]

@@HBPowerwall - Did you film any of the rest of the build ? I'm interested to see the BMS fitted.

[@lnxpro]

@AveRage Joe! You in trouble mate, Peter learned to edit videos! lol.

[@HBPowerwall]

I'm no competition to Joe, he has the BOOOOM ! 💥💥💥💥💥💥💥💥💥

[@glengarrahy5236]

Awesome Video! Do you know where I can buy Samsung 40T in Australia?

[@HBPowerwall]

No but i know Tesla Model3 21700's are heading out way via - www.lithium-power.com.au/ ( DISCOUNT CODE: Powerwalls will save 5% at checkout )

[@HBPowerwall]

No but i know Tesla Model3 21700's are heading out way via - www.lithium-power.com.au/ ( DISCOUNT CODE: Powerwalls will save 5% at checkout )

[@aux1z11]

Where can you get a small spot welder

[@davebacknolaliki1452]

Get a Kweld

[@channghiem5012]

how are you plannng recharging the battery bank?

[@HBPowerwall]

Using a hobby charger

[@thalesmaia6607]

Do you have the next video?

[@Luk1000slowracer]

Hi, ive a question, i have a 48v 10amh ebike battery with a BMS, ive come across an issue, ive checked some of the cells and they are around 3.1v and the rest are at 4.2v, my charger cuts out and doesnt charge every cell to full, im thinking my BMS has broken, also if the BMS is broken can i fix the problem by just simply replacing the BMS and then it will balanceall the cells? Thanks

[@HBPowerwall]

I would assume if the BMS is faulty, replacing will solve the issue - do you have a way of just charging the one low cell? Or is it possible the bms is just reading the wrong voltage and it is really 4.1. I would use caution if your charging and that one cell is much lower than all the other cells will go above 4.2v

[@Luk1000slowracer]

Hi, ive purchased a new BMS which i will put on today, in hoping it will balance them correctly, thanks for getting back to me

[@a-aron2276]

Im about to start doing odd shaped custom batteries in Ireland, is it worth doing do you think? I do it as a hobby for friends and family at the moment but it'd be nice to do it as a good lving. One side note i hope you checked your current runs on that beast, 0.15 x 7mm is good for about 5.5amps per strip (no heat, max 10amp but very hot) according to em3ev. I noticed a couple of series connections there that were only good for about 15amps if i saw correctly just curious if you double up in those areas. I'm new to business, not batteries just incase i come off as one "those" kind of people😛

[@HBPowerwall]

My only hint (that Bruno told me) is use even numbers of cells so much better than odd ...

[@polik185]

Rodney , Hi great videos have you thought of doing weekend workshops ??

[@HBPowerwall]

No - it's too hard as my workshop is also my Work..

[@Zer0phobia]

Love it. Can you make one for my electric FZR motorcycle lol

[@HBPowerwall]

Sure, but you'll have to negotiate with my wife lol

[@Dutch_off_grid_homesteading]

heya repair an old battery from I bike myself was really fun

[@RCFever]

What bms did you use for 21700 tesla cells?

[@HBPowerwall]

That would depend on the application, load, location etc

[@HBPowerwall]

ooh did I use.. none I sent it back to its 'owner' and never heard anything more about the battery

[@mathisbourcier1126]

so that's a 50.4V (known as 52V) 20Ah battery? Do you get denser with 21700 cells vs 18650?

[@HBPowerwall]

Good density with really good amp draw

[@TheYTCG]

Where are you getting the batteries from?

[@HBPowerwall]

www.batteryhookup.com if your in the states is the No.1 place to go if you use "Powerwalls" discount code at checkout you'll save 10% :)

[@yolebricoleurenginelectriq7711]

Salut bonne vidéo pourrais-tu refaire la même vidéo en montrant bien les deux face de la batterie fini et le branchement total du bms en vidéo merci je voudrais me refaire la même batterie que tu viens de réaliser

[@ginofoogle6944]

Short circuiting one by accident with the spot welder.. would make for a funny video =P

[@HBPowerwall]

Fire sells well on youtubes.... ;P

[@wallahiiii5364]

Would u have to do these tests if ur buying the batteries brand new ?

[@HBPowerwall]

If they were new from a reliable sorce I wouldn't test new cells - but if it was from aliexpress or something knowen for fakes I would in a heartbeat

[@wallahiiii5364]

@@HBPowerwall thx for the reply keep up the great videos

[@RATSBLATS]

Is is good practice to use the BTC 3100 to check new cells, not just recycled/used cells?

[@HBPowerwall]

If you are using good quality cells from a Name branded company I wouldn't ... NO, But off brand or from not trustworthy source yes - test every cells.

[@RATSBLATS]

@@HBPowerwall, Thanks for the prompt reply. I'm a complete novice at this and wanting to learn as much as possible before attempting an e-bike battery. Cheers, mate.

[@HBPowerwall]

No worries

[@tron259]

Hello Friend. Where can I buy the point machine you use? Can you give me a link? Regards.

[@RaithUK]

18650shrinkandcellholders.com/kweld/ The one Pete uses i believe is this one. he Linked it on one of his latest videos.

[@HBPowerwall]

Yep, that's the one

[@Jai.shree.Ram8173]

Please tell us if we buy it we have to make battery pack..,.😥😥😥😥🙏🙏🙏

[@kenhtth5397]

👍

[@HBPowerwall]

🖖

[@eddiekytia]

Are you familiar with the wolf warrior 11 electric scooter? It has a 60v battery system that I want to have a custom one built from Samsung 21700 for the same 60v is this something you would be interested in making for me(definitely will pay)whatever you need to do the job

[@HBPowerwall]

NOT a chance lol Took me months and months to build this one due to lack of spare time and trying to film it.

[@frankz1125]

Hey brother . Roughly what do you charge someone to do this work.

[@HBPowerwall]

Never thought about it, but it's more work than you might think.

[@zachniedfeldt]

What would you charge? Seems like youve built some yourself. My base charge is on a non-linear curve related to W/h of the pack to be built, add more features and then the price can change of course.

[@HBPowerwall]

Day job pays $90/hr would have to match that plus materials i guess other wise not worth doing.

[@MrZeek101]

Great job nice a clean build What power tool batteries are these from

[@HBPowerwall]

I'm not sure wasn't told and never seen them before.

[@davey2k12]

I love to see the tool 😆 Only ever seen 18650s in tools

[@pascalhemerik1007]

I still have one like that left 13s i went with 14...

[@HBPowerwall]

Cool

[@marcelopepito51]

why you are not using a fuse wire?

[@HBPowerwall]

ever seen a ebike battery using cell level fuses?

[@marcelopepito51]

@@HBPowerwall what you mean is if the cell has a level capacity not need fuses?

[@HBPowerwall]

Never seen an ebike with cell level fuses... bumping and jolting around will break the fuse wire causing imbalance super fast.

[@MKDUKE123]

It's possible to make it 7, to 13s

[@gsmgsa]

Where are the fuses??

[@HBPowerwall]

eBikes, Laptops, Powertool Batteries - don't have them.

[@GTrainRx7]

When you take them out of the charger, sort them into high to low. As long as you do it when you are moving them from one place to another, it takes very little extra time. Get some single battery wide sorting "boxes" and work from there.

[@HBPowerwall]

That would work so well for really large packs for sure

[@ralphbrunjes6338]

If you are going to do a battery pack rebuild , make sure that you do it all in one video instead of us having to search around for the other videos needed . Also explain what and how you are doing.

[@HBPowerwall]

fuck me, demand much? It's not my job to teach you it's to entertain myself..

[@TeknoTronik]

Next BMS

[@HBPowerwall]

is that the name of a BMS?

[@befr6967]

the BSM Link dosn't work

[@HBPowerwall]

Thats odd - went to rubber dogpoop..

[@KB-jy5hr]

Where is part 3?

[@HBPowerwall]

Part three is where it went home and I never heard of it again - probably because I took so long to make the battery :(

[@rhauff1]

What ARE those BIG fat cells on the left? Read through every comment looking just for that

[@DIYwithBatteries]

Sir can u give those batteries for free, im dying where should i find them.

[@HBPowerwall]

Sorry wouldn't send them to you if i was paid, man i hate postage

[@DIYwithBatteries]

@@HBPowerwall that's ok sir, im just joking by the way. And I got those batteries from laptop service shops searched on maps.

[@adisakphatkhlai8264]

ที่ไม่ใช้แล้วให้ผมบ้าง

[@kwinzman]

Great! You rediscovered en.wikipedia.org/wiki/Radix_sort for finding the right batteries ;-) And yes, I believe this is the fastest way you can find them.

[@kloklojul]

While radix sort has the better run time of o(n + k) I think, quick sort is the fastest on average in most cases

[@kwinzman]

@@kloklojul How is this relevant here? A human can do radix sort easily while sorting batteries or sorting socks during washing or similar tasks. But a human can not efficiently prepare looking up batteries by doing quick sort.

[@kloklojul]

@@kwinzman this is where you are wrong. It's way easier to put some batteries left or right than doing radix sort. But nice try.

[@kwinzman]

@@kloklojul A human is not a RAM that can randomly access and compare batteries in constant time. But you are very capable of fetching the next battery and putting it in one of 10 stacks. I am actually surprised you have doubled down on that odd statement that quicksort would be better.

[@kloklojul]

@@kwinzman everything can be done in place, I am amazed you are thinking radix is in anyway practicle

[@adisakphatkhlai8264]

อยากใด้18650

[@marekyzr568]

Good job. Nice battery. Watch my last movie my bike diy.

[@HBPowerwall]

Will do when I get the chance bud, thanks for the comment

[@timmothyburke]

I found a really good price of about 2 dollars a cell for new cells. Anyone want to get these new 21700 batteries? Chinese supplier, quality might be an issue, don't know. Can be returned if quality is bad.

[@HBPowerwall]

2 dolla batteries lol what could go wrong...

[@mrtechie6810]

Good luck with that! Lol

[@TraudiRex400]

dont like the 40T cells, i highly pref the 50G or 50E cells u dont need 40 amps for a normal eBike battery... the lifetime of these is really short

[@marcelopepito51]

plss answer my question?

[@HBPowerwall]

I think I have

[@rokadamlje5365]

Wait, these are 17$ per cell? Thats like 1000$ per kwh.

[@HBPowerwall]

New yes, how ever these were almost free

[@SuperStststststst]

Hummmm this is very KZbin... I'm sure it will do very well ... but I signed up for low production value

[@HBPowerwall]

Bloody hope its very youtube!!!

[@matthewmeuleman3369]

Here you go, low production value, cheap special effects, it's what got me into KZbin. kzbin.info/www/bejne/r3rImWqHaNWNqKs

[@Steveah91]

build a even bigger battery pack.

[@HBPowerwall]

Already have :) 4480 cells enough?

[@igualnimp]

Well that's nice but not very helpful for beginners like me :p

[@HBPowerwall]

Sorry about that, I make video's for me that I enjoy - try not to teach as i'm not an expert.

[@andrewriley9913]

Bloody elevator music..get rid of it..good show

[@HBPowerwall]

😜😆😊😉

[@nerdshtenterprises2295]

👍

[@HBPowerwall]

👍