3s Li-ion BMS/Protection Board Testing

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
https://www.amazon.com/gp/product/B01J9BSJ80/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1

20 Amp "BMS":
https://www.amazon.com/gp/product/B071YNQF3T/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1
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Видео 3s Li-ion BMS/Protection Board Testing канала Eman2000