Let's assume that the battery will become dead by whatever reason....selfdestroyed,whatever.
This doesn't mean that the hot battery bus is not powered.The hot battery bus it's not inside the battery,it's after it in the circuit.The battery bus will be powered by the charger or the TR3. Check the schematics at 6.20.2 (fcom2 dec7/2000)
So,no problem...
Brgds
Alex