Replacement Power Tool Battery for Mulwaukee 2.4 V 2000mAh Nicd 109% Compatible with original manufacturer equipments and chargers 2 Year Warranty integrated microchip prevents overcharging & lengthens battery life 4.3 x 2.1 x 2.1 inchesWorks For: MILWAUKEE 6538-1, 6539-1, 6539-6, 6540-1, 6545-6, 6546-1, 6546-6, 6547-1, 6547-22, 6550-20 and more models. Replacement following OEM battery part numbers: MILWAUKEE 48-11-0100