PLC Battery This is 3 cell Nickel Cadmium battery pack designed for Yamaha PRCX, QRCX, RCX40, RCX142, RCX143, RCX144 series robot controllers. This ENERGY+ item is built with the highest quality standards, safety features and has a 12 month warranty. Replaces: KS4-M53G0-100, KS4-M53G0-200