The Hikoki BSL1820M 2.0Ah 18V Battery is a compact battery that delivers impressive power levels despite its size. The battery includes 3 way protection including deep discharge and overload protection. Fast re-charge plus energy saving extends the life of the battery and ensures that you can keep working with less downtime. Up to 1,500 cycles rechargeable through multiplex protection circuit that prevents overload, overcharge and over discharge The Hitachi UC18YFSL 14.4V - 18V Battery Charger will charge Hikoki and older Hitachi slide on lithium-ion batteries. A fan cooling system built in to the UC18YFSL cools the battery during charging to extend the life of the battery. Features preventative mechanism against charging a hot batteryand 3way overcharge protection system to ensure battery is not overcharged Suitable for use with the following batteries BSL1415 BSL1415X BSL1420 BSL1425 BSL1430 BSL1440 BSL1450 BSL1815 BSL1815X BSL1820 BSL1825 BSL1830 BSL1840 BSL1850 BSL1850C BSL1860