How to charge custom lithium ion batteries (without a BMS)

Some people like to make their own lithium ion battery packs out of old laptop cells or whatever, but charging them can be a confusing task. This is the cheapest, safest, and most efficient way I've found to charge them.
From Banggood (stuff I used for this video):
Balance charger: goo.gl/HKoHwn
Balance wiring cables: goo.gl/Y6oGrH
Soldering iron: (amazon)
geni.us/8Qmj [Amazon]
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