Changing CPU batteries in a pin is very important. If you don’t perform it yearly, chances are they’re going to leak battery acid on your PCB and ruin the board, leading to an expensive repair.
You can upgrade your game to use NVRAM and you will no longer need batteries. Here is one solution that comes in kit form:
http://lockwhenlit.com/anyPin.htm
Most games will require soldering for this upgrade – we can perform this service for you!