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Do you recognise this part?
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ali_asadzadeh:
Hi,
It's used for  2S Li-ion protection, the PCB marking is PCM-LX2SBA-3316 and on top of U3 it's written 3J39

Do you have any Idea?
SiliconWizard:
Not sure what your question is.
It's a PCM board with most likely B+ and B- going to the battery + and - (2 cells in series, with the middle point probably on the central pad marked BM1?) and P+/P- being the output pins. But you probably already knew that.

From the form factor, it looks like a PCM made for a 2x18650 pack. Very similar to this:
https://www.ebay.com/itm/2S-4A-7-4V-Li-ion-Lithium-18650-BMS-PCM-Battery-Protection-Board/183476226508
http://www.all-battery.com/pcbfor74vli-ion186501850072vbatterypacks8alimit-32004.aspx

But not quite the same. Obviously hard to derive the exact specs then (max charge/discharge current).

ali_asadzadeh:
Thanks, I want to know the main controller part number.
abyrvalg:
Many ebay/ali LiIon protection boards utilize ICs made by Ablic. Try matching the pinout with this: https://www.ablic.com/en/doc/datasheet/battery_protection/S8252_E.pdf
ali_asadzadeh:
Thanks
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