CALIFORNIA WARNING: This product can expose you to chemicals, including lead and DEHP, which are known to the State of California to cause cancer and birth defects, or other reproductive harm. For more information, go to https://www.p65warnings.ca.gov.
No-solder AA battery replacement system.
Suitable for use in any game that uses three AA batteries on the CPU board.
Installation is easy - simply place the dummy batteries into the CPU battery holder with the red "+" and black "-" facing out and corresponding to the board markings for positive and negative.
Mount the remote holder away from the boards in the head to prevent corrosion damage should the batteries ever leak.
Reference:
RBM