Bosch GBA 12v 2.0Ah battery pack - Datasheet

[LINACboy]

Hi everyone,

I'm looking for a datasheet for the Bosch 12V 2.0Ah 3S Li-Ion battery pack.

Specifically I'm interested in what kind of protective functions are implemented on the internal PCB, their thresholds and what exact action is taken when they are crossed:

overcurrent (peak charge / discharge value)
overvoltage
undervoltag (discharge cut off threshold)
overtemperature

On Aliexpress you can buy knockoffs of the plastic parts and PCB w/o the cells that go by the name BAT411, BAT412A, BAT413A BAT420 and similar. But I can't seem to find a circuit diagram. Has anyone ever reverse engineered the PCB of either the original or knockoff units?

I want to design some portable appliances around this pack (LED-flashlight, USB-powerbank, bar-graph charge indicator, etc.) and would like to know how much additional effort it takes in order not to fry or unnecessarily deteriorate these packs.

[yelkvi]

These parameters are easily determined experimentally.
A piece of nichrome coil, a 12V light bulb and a simple multimeter.
Or do you not have the original battery?

[LINACboy]

I bought into the Bosch system, so I actually have several. But rn I'm still too cheap to risk destroying one before knowing exactly what is and isn't implemented.

For example iirc the Makita LXT 18V system has a micro controller in every pack, which monitors and counts hazardous events (overtemp, imbalance and such). If it detects too many events, it prevents you from recharging w/ an OEM-charger. They also have non-resetable fuse links.

I don't think, the Bosch system is that complex. But if someone already did all the legwork or has access to OEM-data, I'd love to benefit from that.