The Exile EX-1 Battery Keeper charger/maintainer is perfect for anyone who doesn't drive their 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.The EX-1 is water-proof and dust proof, so it can be permanently mounted in the vehicle next to the battery compartment. With the EX-1, you will always have the peace of mind of knowing your classic vehicle's battery is ready when you are.