The Hitachi BSL1860 18V 6.0Ah Lithium Ion (338890) battery is a powerful, long-lasting battery for a variety of Hitachi 18V slide-type power tools. It delivers increased productivity and runtime thanks to the large 6.0Ah (Amp Hour) capacity. The Amp hour capacity refers to how long the battery can last before recharging. 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. This impressive battery can be used to power Hitachi all 18V slide type cordless tool models. The BSL1860 battery charges the fastest on charger model UC18YSL3 (38 minutes). Other compatible charger models and charging times include: UC18YFSL (90 minutes) and UC18YKSL (180 minutes) (chargers sold separately).The Hitachi BSL1860 battery is warrantied to the original purchaser to be free from defect in materials and workmanship for a period of 2-years from the original purchase date.