This Ryobi OP40201 40V battery delivers fade-free power and an extended run time to a variety of cordless lawn and yard tools, including trimmers, chain saws, blowers, mowers, and more (sold separately). Boasting a 2.0Ah battery life, this OP40201 lithium-ion battery weighs less and runs longer than similar NiCD batteries in its class. Users will delight in this heavy duty yet lightweight battery during extended outdoor projects. The built in LED display monitors fuel levels, making it easy to check in on battery status in the middle of a job. This OP40201 battery charges on Ryobi 40V li-ion chargers including the OP401A (sold separately).