The 18 V 2 Ah lithium-ion battery with fuel gauge BSL1820M (377797M) is a powerful, long-lasting battery for a variety of Metabo HPT 18 V slide type power tools. It delivers increased productivity and run time thanks to the large 2 Ah capacity. The Ah capacity refers to how long the battery can last before recharging. This impressive 18 V 2 Ah lithium-ion battery can be used to power all Metabo HPT 18 V 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. The Metabo HPT battery is warranted to the original purchaser to be-free from defects in materials and workmanship for a period of 2 years from the original purchase date. Every Metabo HPT accessory is designed to the highest standards and is rigorously tested for both performance and durability.