The 18V Batteries/Charger Kit UC18YKSLSM includes two (2) BSL1820M 18V 2.0Ah Lithium Ion batteries with battery charge indicator and one (1) UC18YKSLM Battery Charger. It is a powerful battery/charger combination for a variety of Metabo HPT 18V slide-type cordless power tools. The 18V 2.0Ah Lithium Ion Battery BSL1820M (339782M) is a powerful, long-lasting battery for a variety of Metabo HPT 18V slide-type power tools. It features a battery charge indicator button and 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. The 18V Lithium Ion Slide Battery Charger (UC18YKSL) is a powerful charger for all Metabo HPT 18V slide-type cordless tools. The UC18YKSL Charger comes with a color light indicator to clearly indicate the stage of battery charge. The UC18YKSL charger is warrantied to the original purchaser to be free from defects in materials and workmanship for a period of 1-year from the original purchase date.