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Reverse engineered circuit board of the HX-2S-JH20 PCB . Aka 2S 10A w/Balance Li-ion BMS Protection Board.

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HX-2S-JH20 reverse-engineered (2S-10A-Balance-Li-ion-Protection-PCB)

Circuit trace:

HX-2S-JH20 - Circuit trace

Components:

HX-2S-JH20 - Components

The circuit is based on the HYCON Technology Corp. HY2120-CB battery protection IC, and 2 HY2213-BB3A battery balancer ICs. Datasheets available here:

These provide considerably more information about the board's functions than the description published on eBay and AliExpress listings. Notably, the balancing action will not start until safe voltage threshold (4.2±0.025V) for either lithium cell has already been reached. This behavior was also verified on test bench. Then, since the balance MOSFETs can only discharge the cells at I = 4.2V/62ohm = 68mA, it is very likely that cell voltage will only keep climbing during charging, which could make your batteries blow up.

Eventually, the HY2120-CB should cut turn off a protection MOSFET at 4.28±0.025V (I have not actually tested this).

The N-channel MOSFETs driven by the balancers appear to be HY2213 by H&M semiconductor, datasheet: https://www.mikrocontroller.net/attachment/212878/HM2302A.PDF (marking: A2SHB)

I have seen many vendors for the large MOSFETs driven by the protection circuit; at least Fairchild Semiconductor FDD6030L and Alpha & Omega AOD452 (in the picture) have been spotted.

Datasheets:

Kicad Eeschema Schematic

Work in Progress

HX-2S-JH20 PDF

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Reverse engineered circuit board of the HX-2S-JH20 PCB . Aka 2S 10A w/Balance Li-ion BMS Protection Board.

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