The Duracell® line of Battery Chargers feature rapid charge technology for faster, more accurate charging, and do not require installation or set up. The simple plug-and-charge solution makes these chargers ideal for extending and recharging all types of 12-volt lead acid batteries. The three stage charging process ensures the battery is always fully charged, but never overcharged. Most units are conveniently packaged in a hard plastic carrying case that makes these chargers portable and easy to use.