Building a DIY Li-ion Battery Pack From Scratch

This video explains the basic tools and the complete process for building your own lithium ion battery pack. The pack built in this video will be used in an RC flying wing (AR Wing Pro), however the steps are the same for any lithium ion pack.
This video shows how to build your own lithium ion battery pack safely using a soldering iron. The same process can be followed using a spot welder instead of soldering. If you are hoping to make many battery packs, I would highly recommend getting a spot welder.
Used in the video:
Molicel p45b 21700 cells
Hakko 888 desk station
Weller p100 soldering iron
Mg Chemicals No-clean solder
MG chemicals rosin core solder (23 and 20 gauge)
Cross locking tweezers
4s balance lead
xt-60 with 12 gauge wire
Fibre tape
2mm or 4mm thick impact foam
Useful:
soldering Helping hand
small desk vice or clamp
good eyes and a steady hand