The 18V 2.0Ah Lithium Ion Battery with Fuel Gauge 377797M is a powerful, long-lasting battery for a variety of Metabo HPT 18V slide-type power tools. It delivers increased productivity and run-time thanks to the large 2.0 Amp Hour (Ah) capacity. The Amp hour capacity refers to how long the battery can last before recharging. This impressive 18V 2.0Ah Lithium-Ion battery can be used to power all Metabo HPT 18V slide-type cordless tool models. For protection from the elements, this battery features a resin coating. Its complex circuitry also prevents damage from overload, overcharge, and over-discharge of the battery.