Cordless Battery, Battery Capacity 8 Ah, Battery Chemistry Li-Ion, Number of Batteries Included 10, Voltage 18V DC, Charger Input Voltage 120V AC, Battery Series M18(TM) REDLITHIUM(TM) FORGE(TM), Overall Height 3 1/2 in, Overall Length 5 1/4 in, Overall Width 3 3/8 in, Weight 2.4 lb