I have been asked about how I charge my Li-ion battery pack before. I made a video on that subject and put simply, I use a hobby balance charger. Using BMS or Battery Management System boards has come up in the comments. In this video I do some basic testing of a couple that I bought on Amazon. Now to be fair the red one is advertised as a protection board not a proper BMS and as a protection board it does an OK job. The second one, however, was advertised as a BMS though I would classify it as a protection board.
Here are links to the boards though I wouldn't recommend buying them.
30 Amp Protection Board
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20 Amp "BMS":
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