I recently built a 12s4p pack, charged it once, used 2ah, and blew my vesc. The pack is made of 48 Samsung 25R cells(444wh,<80amps max), 10mmx.15mm pure nickel strips, and 10 awg wire.
The BMS somehow stopped working with it, so I am selling the raw pack with balance cables and full insulation Here is what it looks like:
This is the orginal BMS that I was planning to use.
I sandwiched the balance leads between kapton tape on top of the batteries. And used 10awg segments to connect the sides so the pack could be slightly bended. 180mm heatshrink avaliable for free.
US only from Belmont, CA
Price: 280$ shipped. (paypal goods & service) Includes the 12s4p 25R pack seen (NO BMS)