With its four-stage charging circuitry, the Exile® EX-1 Battery Keeper® charger and maintainer is perfect for anyone who doesn"t drive his vehicle every day. This is much more than a battery charger; the EX-1 keeps your battery in peak shape by providing a conditioning charge any time voltage begins to dip. This "pulse charge" maintains the battery without over-charging or "gassing" the battery, which leads to much longer battery life. It includes an LED battery status indicator, so you will always know your battery"s state of charge. The EX-1 is waterproof and dust-proof, so it can be permanently mounted in the vehicle next to the battery compartment.