For PS-1 if the battery is dead enough the processor does not write to memory. It knows it does not have sufficient power. It is usually the partially charged battery that causes issues in that it does start writing, but can not finish.
THAT CAN HAPPEN with BCR too. If BCR only allowed to half charge and turned off same happens. Or an attempted direction change with insufficient charge. I have had to do resets on BCR engines. So let them fully charge. Normally the newer 1997 up PS-1 stuff is less effected. G
