I recently purchased a spot welder and try to DIY a battery pack for my e-bike. Please watch the unboxing/test of the spot welder video if you are interested:
My plan is to make a 48v 13s8p battery pack. The 18650 cells i have are harvested from modem battery packs. I am not sure if the batteries can handle the current for my e-bike motor(500W). It is my first time to DIY an e-bike battery pack, all comments are welcome. Thanks!