The AEG 18 Volt PRO Li THIUM ION replacement batteries suitable for all current AEG 18 volt machines. They have the latest AEG PRO Li THIUM ION technology which protects both battery & machine in 3 ways: 1) Thermal Overload protection The thermal overload protection constantly monitors the temperature of the battery & automatically safeguards against overheating therefore increasing the life of the battery pack. 2) Current Overload protection Too much current draw can permanently damage the cells of the battery thus reducing battery life. The Pro Lithium Ion current overload protection automatically shuts the battery down if the current levels get too highbut automatically resets its self so there is no loss of productivity. 3) Individual cell monitoring Individual cell monitoring ensures every cell in the battery is performing to its maximum capability to ensure optimum productivity. The cell monitoring also runs throughout the charge process to make sure no cells are damaged at this time. L1815P 18 Volt PRO Li THIUM ION replacement battery has a Capacity: of 1.5 Ah.