Milwaukee 6550-20 Power tool battery for Milwaukee 6540-1 6545-6 6550-20 48-11-0100 Base battery with four contacts on top. 0.43 2.4 1.5 4.37 1.04 1.12 12 Months NiCad Black Same Business Day Hi-Capacity No http://site.apexbattery.com/logos/hi-capacity.jpg 609525016536 New BB