What difference does it make whether the processor registers a reboot event or a power outage, if the effect will be the same?
krzbor wrote: It could find that processor and cut power to it, replace the batteries and connect the power supply?
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You'll cut off a leg of let's say VCC to it, and it can still parasitically power up from some IO pin.
I've also encountered such a behaviour of the BMS (this time from a laptop), that although unplugging it from the cells didn't block it completely, but despite replacing them the laptop died after the same time as on the old worn-out ones, because it already had the learned capacity of the cells, the number of cycles and a lot of other parameters (I recommend datasheets of BQ series chips).
