Maximalpower 2.4V 1500mAh Ni-Cd Power Tool Replacement Battery for Panasonic EY503B, Part Number: EY9021/B EY903/B Power Tool Battery for Panasonic 2.4V 1500mAh Nicd 100% Compatible with original manufacturer equipments. MAximalpower is one of top selling brands for replacement batteries at amazon Backed with 1 year warranty and $22 million product liability coverage Integrated microchip prevents overcharging & lengthens battery life