How to build a MASSIVE 72V DIY battery pack for high power e-bike

20s14p Li-ion battery pack
Samsung 30Q cells
72V 42Ah
Max continuous discharge 220A
Max peak discharge 300A (BMS limited)
Dimensions (mm) 325 x 144 x 126

Want me to build a battery pack for you? All details here:

Need help designing you battery pack?

eBike using this battery pack

Samsung 30Q cells

18650 holder STL file

20s ANT BMS

ANT BMS iphone app

kWeld spot welder

Additional drawbacks of kWeld not mentioned in video

Nickel strip

Copper plating used in series connections

400mm heat shrink wrap

Kapton tape

18650 Insulator rings

EC8 connector

#electricmotorcycles #ebike #diy #motorcycles #lithiumionbatteries #diyebike #motorcycles #caferacer #dirtbike #electricvehicle

[SandervV]

only 3 minutes in, it's obvious how mucht thought and precausion has gone into the assembly. very nice watch, thanks .

[errick]

Best part of this project is the cool OG red shop rag on the workbench. Well done, sir...

[republicofvegans]

Honestly, I would recommended you use Molicel 45a 21700 4.2ah cells they are the bang for youre buck!

[chrisleech]

Serious pack build Hands down the best video on the topic. Great method for durable bonding and agree with the copper buss and soldering technique you employ. Hard to get the Samsung 30Q 3000mAh Got to choose from what isn't sold out. And as with everything post pandemic they are more than before. Certainly in Aug 2023 you are looking at ~$900 USD for 84V 20A alone.
I would buy an 84v 23S 10P pack off the shelf but it is a fools game. No BMS and no idea as to brand of 18650. I have to give serious thought to replacing the lead acid batts in my Damak Eagle

[Peter.Sky.Walker]

That thing is a beautiful monster. I'm sure it could power my whole house for a week.

[EDM-Jigger]

Bro, you should definitely make a huge batch of those cell holders, because those are hands down the best design I've seen in the least bulkiest. and I know a lot of people would love. to get their hands on it to save space on their battery builds.

[diyzona]

It's always interesting to see how we bother with wire size but solder can take it all. Same solder can take 10A or 1000A. Beautiful material :)

[schmeglyomigy]

Hey I wrote a comment yesterday about my 52v battery that I could only get a reading of 14.5 volts out of. You replied saying I could do a zoom but I just thought I would write another comment to tell you what I would consider to be very important information before we go on the zoom. So I opened the battery a couple minutes ago to test the voltage, and I put the negative prong on the negative nickel strip and positive on the positive nickel strip, and I got a reading of 58.2 (52v is 58.8 full charge) so that’s the right voltage. Part of the bms wires are exposed so I put the negative prong on the negative bms wire and the positive prong on the positive wire. It read the exact same voltage of 58.2. Before, my worry was that the positive or negative wire wasn’t soldered on good enough, but now I know that they are and both give the correct voltage. This is good, because now I know 100% that it is an issue with the bms and not something else. I am going to book a zoom call as I would love to hop on a zoom call with you to get this figured out. Especially now that I know the problem. I just thought I would write this comment to let you know what I’ve narrowed it down so that way on the zoom we can get it fixed.

[dtiydr]

You know its a big ass battery when you need a gas burner to solder, love it!

[jamescole]

I have built a few packs in my time. This is a nice build.

[browner]

I'm buying a year old Daymak EM2 today.I want to convert to lithium from lead acid.Videos like this are helpful.Thanx🇨🇦

[johnthompson]

Wow! This was an extremely helpful video! Great find! Thanks for making the vid!

[KnHawke]

<applaud> I love how you're not effing around with any of the connections through soldering and spot welding!

[askforever]

Know what ?? I will use a 550 watt soldering iron to solder the copper strips !! Fast job ! My original idea is to melt things to hell with this thing . Also, that you have said for 220 amps, that can easily output about 800amps if needed, or that is what I would let it do . Well if you think where the heck did I get the idea of doing destruction with this beast, have a look at the channel named : COLIN FURZE !!! He is an absolute beast !! This channel too is amazing ! Nice videos ! Keep it up ! Hope you get a sponsored soon !

[TheRoadtoGonzo]

This was a great build video, pls keep em coming. I am just finishing my first 52v 20ah pack and this helped give me some ideas on finishing up, I'd love to see some of your ebike builds as I have a qs205 5t sitting here waiting to be built into a rim.

[jonnyswalk]

Absolutely superb in depth video.So well explained and filmed put. Like many here, I’d love to see this on the bike that its been made for and demonstrated 😊 👍

[jojox]

So dope. We need more videos from you about your bike, builds, specs, etc....

[oddsman]

21k peak power would probably ignite my Vsett motors in flames like Ghost Rider. 😋

[BlackcowEnt]

Insane battery!! Looking forward to a video about the ebike!

[jaja]

Brilliant stuff, I'd have watched this if it was normal speed the whole build. If possible, could you release an unedited build showing every moment, like you did here but without speeding up or doing cuts. Either way this was the best battery video for powerful ebikes I've found from months of looking