Compatible with all RYOBI 40V Lithium tools and chargers, the 40V 4AH Lithium Battery is the perfect addition to your RYOBI 40V tool collection. It's lithium cells deliver fade-free performance from start to finish. The convenient on-board battery life indicator keeps you informed while you're out in the yard tackling your landscaping jobs. The 40V 4AH Lithium Battery's extra cell capacity is perfect for higher output tools like 40V mowers, blowers and chain saws. RYOBI 40V Lithium surrenders nothing but gas.