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This battery is compatible with all HART 20V power tools. It features Lithium-Ion technology to give you long-lasting and fade-free power to get you through any project you decide to take on. This battery is designed to be compact and lightweight for more maneuverability and while reducing user fatigue. Whether you are maintaining your yard with HART outdoor tools cleaning and maintaining your car with HART automotive tools or keeping cool and entertaining with HART lifestyle tools the HART 20V 4.0 Ah battery is there to provide the power you need when you need it with 4x longer runtime than the HART 20V 1.5 Ah Lithium-Ion battery. This pack of batteries is sold as batteries only and does not include a charger or a tool. Whether youve got one newly bought HART tool or All HART tools this pack of batteries is a perfect addition to any size HART tool collection.