Ebike Battery 2 REBUILD

This is a rebuild for an ebike battery that had Lead Acid motocycle batteries instead of lithium ion ones which are generally used for ebike and with electric motor controllers.
To get the material or tools featured in this build, please check links bellow:
T12 soldering station : s.click.aliexpress.com/e/_Del...
LiitoKala Lii 500 tester : s.click.aliexpress.com/e/_Dd3...
10s BMS : s.click.aliexpress.com/e/_DEs...
18650s : s.click.aliexpress.com/e/_Dk5...
Spot welder : s.click.aliexpress.com/e/_DCM...
Nickel strips : s.click.aliexpress.com/e/_Dd6...
Solder : s.click.aliexpress.com/e/_Dlz...
Flux : s.click.aliexpress.com/e/_DdW...
Hot Glue gun : s.click.aliexpress.com/e/_Dl2...
Heat shrinking tubes : s.click.aliexpress.com/e/_DFX...
mini angle grinder : s.click.aliexpress.com/e/_De8...
cordless rotary tool : s.click.aliexpress.com/e/_DkG...

[@hexidev]

Mismatching 18650's isnt the right way

[@OhadooElectronics]

what I usually do is I try to make the parallel groups similar as possible mostly in terms of capacity so that they have same capacity roughly, and then I consider the brands also as possible after that. it seems to work fine for me

[@hexidev]

​@@OhadooElectronicsyou would also need to measure the internal resistance and each shouldnt deviate too much.

[@OhadooElectronics]

yeah someone else told me about that, right, I will pay attention to that in the future. thanks