Bosch BAT836 Standard 36-Volt 2.0 Amp Hour Litheon Slide Style Battery Weight of an 18V NiCd Battery 2X the power of an 18V NiCd Battery Up To 2X the run time of an 18V NiCd Battery 5X more charges than competitive Lithium -ion batteries Use only with Litheon 36V Charger -- BC830