DIY 18650 Best parts I've found so far

Power System
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I normally build e-bike batteries and was interested to see if I can build a robust (for 300amps) 3 x 14s7p hooked up in parallel and then use them individually so I can use them for my e-bikes as well.

Here’s what I’ve found so far:
18650’s: EV West - Electric Vehicle Parts, Components, EVSE Charging Stations, Electric Car Conversion Kits - on sale for July2019 $630 for 200 of them!
3000mAh and 15A → 30a peak up to 80c

connect them up with these: Customized Nickel Welding Plate Copper Strip For High Current 18650 Lithium Car Scooter Battery Pack - Buy 18650 Copper Strip,18650 Welding Plate,18650 Copper Welding Plate Product on Alibaba.com
Use copper terminal rings: 10Pcs 200A Kupfer Batterie Kabel Stecker Terminal Crimpen 16 35mm2 Draht OT 200A CRIMP TERMINAL|crimp terminal|cable connector terminalconnector terminal - AliExpress

I use this to weld: DIY Arduino Battery Spot Welder Prebuilt Kit V4 - Malectrics

If I continue with this sport I’m going to attempt to build a 18650 battery.

Hope this helps someone

3 Likes
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go for it, and let us know how it goes.

Myself and least one other person here on the forum has used the Malectrics Arduino/Car Battery Spot Welder on the 18650 project. Worked well for me.

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That’s the best price I’ve seen on Sony vtc6. Make sure they are legit.

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EV west is legit. Those are genuine batteries.

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Nice! I like the concept of those copper strips.

I used that spot welder…worked well. They now supply better welding tips, I’ve got the previous type. One thing to note and don’t make a silly mistake as I did. When you assemble it, make sure the cooling fan is blowing into the unit, not out of, like I did (why?? :confused: ). The solder connecting the diodes melted as they got too hot. Once I found the error of my ways, they worked much cooler.

1 Like