20 Volt MAX Extended Run Time Lithium Battery is compatible with the 20-Volt Max line of power and gardening tools. Ensure your 20 volt cordless BLACK+DECKER tools or outdoor power devices have a backup power source with this lightweight lithium-ion battery. This unit resists drainage and retains its charge when not in use, so it's ready to go even after long periods of inactivity. Give your equipment a jolt with a chemically-advanced battery that is superior to NiCd in performance and endurance. Holds a charge for as long as 18 months.Snap-on latch and quick-release lever enable quick swap-outs.Formulated for longer runtime and improved performance.Compatible with the 20V MAX line of power and gardening tools.