Power up your indoor and outdoor tools with the Black and Decker 20V Max Battery. Use it to work with up to eight different lithium outdoor tools and a variety of other power tool, as well. The Black and Decker battery holds a charge up to five times longer and is built to last, giving you power year after year to accomplish just about any type of project or task. Add or remove it with ease as it comes with a spring-loaded latch design that makes it simple to keep it locked in place when in use. This 20v lithium Ion battery can be used as a backup power source for most of your power tools while on the work site or at home. It is ready to go even after it has been stored for a while as it can hold a charge up to 18 months. Having a backup battery allows you to charge one while using the other, eliminating down time.