GPK Systems Battery for Milwaukee 6538-1, 6539-1, 6539-6, 6540-1, 6545-6, 6546-1, 6546-6, 6547-1, 6547-22, 6550-20 Stick Style Power Tools Battery 48-11-0100 2.4volt 3.3 Mah Ni-mh Replacement Capacity: 3300 mAh Voltage: 2.4V Type: Ni-Mh Service & Support 1 year warranty Batteries for power tools are manufactured brand new with high quality materials