18V 4.0Ah Battery Pack | Bl4018 Cordless power Convenient Part of the 18V Lithium-Ion System Warranty: 2 years Black & Decker Slide Replacement Battery 18V 4.0Ah Li-Ion | Bl4018 The Black & Decker BL4018 Li-Ion Slide Battery Pack holds its charge in between use, meaning that it does not require charging before each use and is ready to use. The Lithium Ion technology delivers the same great performance of NiCd batteries, but is lighter and more compact. Specifications Battery Capacity: 4.0Ah Battery Chemistry: Li-Ion Voltage: 18 Volt