This offer features a high-quality battery that is ideal as a replacement for your old or defective tool battery, as well as an additional spare battery for on-the-go use. Please note: Batteries that come with a charger should only be charged with that specific charger. Only new quality brand cells are used. Protective electronics and the use of high-quality components provide a high level of safety against overcharging and short circuits. This allows the battery to achieve a higher number of charge-discharge cycles, resulting in a longer lifespan for your new battery.