Here's how I built a 52V eBike battery for a Rad Power Radrunner 2. I go through the whole process, selecting the right battery, to pack layout and welding, wiring a BMS and wrapping in heatshrink and installing.
00:00 Intro
01:15 Battery Theory
04:49 Battery Shopping
08:25 Pack Assembly
14:15 Pack Welding
23:16 Pack Wiring
33:24 Heat Shrink
35:40 Install & Test Ride
Supplies used in the build:
Batteries: https://www.18650batterystore.com/products/eve-18650-33v
Bracket: https://amzn.to/3RYxl04
Nickel Strip: https://www.18650batterystore.com/products/2p-pure-nickel-strip-1kg-roll-for-battery-spot-welding-18650-21700?variant=41300289126551
XT60 Connectors: https://amzn.to/3tARvmo
14S BMS: https://amzn.to/46KdLZx
Kapton Tape: https://amzn.to/45vLogL
Heat Shrink: https://amzn.to/46rCBxz
Velcro Straps: https://amzn.to/3PRGyVi
kWeld Battery Welder: https://www.keenlab.de/index.php/product/kweld-complete-kit/
kCap Module: https://www.keenlab.de/index.php/product/kweld-ultracapacitor-module/