The 2-pack of HART 20V 4.0Ah Lithium-Ion battery is an excellent addition, or start to, any DIYer’s HART tool collection. 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. Choose between 8 tools the HART 20V Sander, HART 20V Hand Vacuum, 20V 1/2 Drill, 20V Impact Driver, 20V Inflator, 20V LED Spot Light, 20V Reciprocating Saw, HART 20V Jigsaw. This kit also includes a Fast Charger that charges up to 3X faster than a standard charger.