A long lasting, powerful 4ah rechargeable Lithium Ion Battery for use with Bosch\'s 36v Garden Tools. Lithium Ion batteries are lightweight, have a low rate of self discharge & do not suffer from memory effect so do not need to be fully drained of power prior to charging. Bosch\'s Electronic Cell Protection technology defends against overload, overheating & deep discharge. Features & Benefits: Lithium-ion technologyBosch Electronic Cell Protection guarantees long lifetime of the batteryCompact, durable and quickly chargedFull power at all timesLong lifetimeHigh power, low weightSame power at half the size Specifications: Battery Type - Lithium-ionVoltage - 36vBattery Capacity - 4ahCompatibility:Rotak 43 LI, Rotak 37 LI, Rotak 32 LI, ART 30-36 LI, ALB 36 LI, AKE 30 LI.