Bosch Core18v 6.3 Amp Hour Lithium Power Tool Battery Kit (Charger Included) Outdoor Decor panic proof privacy keyed entry locking panic proof privacy keyed entry locking ) 20 in Firebox Depth (in 80% more than previous generation cells CORE18 V – features an enhanced cell design that provides up to 20% longer runtime than previous gen 6 and providing performance comparable to batteries that are up to 35% larger CORE18 V – features 100% backward and forward compatibility with all Bosch 18 V tools and chargers CORE18 V – works in cold weather conditions down to 4 ° F BC1880 – features regulated dual mode charge for cell protection