I replaced the cells in the batteries, but as I see the BMS is dead inside, what I want to replace.
I bought from China a 3 cell balancer+protection board what I installed inside the battery, now the laptop starts from the battery and the laptop can charge it, but the battery now not have any kind of BMS inside so now it is not reporting the battery charging status and I not know how many time is remaining from the battery until it discharges.
The only thing I need to know is for which chip goes the 2 data wires to the motherboard from the battery and from that I will (hopefully) know what kind of protocol it uses for communication.
I hope somebody can give for me a schematic for this great laptop.
I found here the schematic, but an account for download costs 12 usd and the laptop not worth more than 10 usd: https://schematic.vn/threads/thinkpad-6 ... 8608.5466/
Thanks in advance!
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