Black plastic 3 X AA battery (Alkaline batteries recommended if you insist on using this) holder used in Willaims pinball games. Often mounted on an auxillary PCB #5768-13880-02 in WPC-95 games.
In ALL cases we recommend the use of an NVRAM to replace the batteries due to the risk of battery leakage destroying the logic boards. Remote battery holders can still cause issues if the alkaline leaks out and migrates to the boards or any metal nearby and corrodes it.
We have NVRAM for both the pinball games that used these battery holders, typically the WPCs games.