The 6 volt NiCad, easy-off battery gives you 3000 shots when fully charged. Each tool ships with 2 batteries so you’ll never be out of power. The battery takes about an hour to fully charge. Also, there’s only one way to put it in so you never have to worry about a busted battery pack. The T3 battery features an “off” mode – a stand-by mode which disengages the battery so it doesn’t drain the battery overnight. When you come on the jobsite just push the battery in and the flashing green light tells you you’re ready to rock and roll.