We have two muscle cars that my husband rebuilt and they only get driven in good weather. That being said, they do not get driven enough to keep the batteries charged like they should be. My husband did some research and decided this was the best one for his needs. He loves this battery tender. It has a solid state two color LED that shows the stage of the charger, quick connect harness for hard to reach areas, for all lead-acid - flooded or sealed maintenance free batteries (AGM & gel cell, has 4 step charging problem (initialization, bulk charge, absorption mode and float mode) that maintains batteries at full charge without overcharging via its 4-step charging system, it automatically switches to float/maintenance mode voltage after fully charging the battery, it has temperature compensation so optimum charge voltage according to ambient temperature, and spark proof and reverse polarity protected; 10-year limited warranty. He is now happy that the batteries are kept in perfect working order and has told all his gear head buddies to buy this product.