Kit: the 18 V batteries/charger kit (UC18YKSLS) includes two (2) BSL1820M 18 V 2 Ah lithium-ion batteries with battery charge indicator and one UC18YKSL battery charger. It is a powerful battery/charger combination for a variety of Metabo HPT 18 V slide type cordless power tools. Battery: the 18 V 2 Ah lithium-ion battery BSL1820M (339782M) is a powerful, long-lasting battery for a variety of Metabo HPT 18 V slide type power tools. It features a battery charge indicator button and 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. Charger: the 18 V lithium-ion slide battery charger (UC18YKSL) is a powerful charger for all Metabo HPT 18 V 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 defect in materials and workmanship for a period of 1 year from the original purchase date.