Smaller and lighter than a full-size shop charger, this 20-amp smart battery charger still covers lead-acid batteries at 6V, 12V, and 24V plus 12V and 24V lithium and LiFePO4 packs, and it can maintain or desulfate an aging lead-acid battery. Choose from four modes: charging mode auto-detects battery voltage and applies 7-level intelligent charging that steps down to trickle once full, maintain mode keeps a battery topped off with a gentle current, desulfation mode applies pulse repair to clear sulfate buildup, and supply mode can output as low as 1V for a fully drained battery. A 3.6-inch LCD screen displays the active mode, voltage, current, and power percentage, and the compact fan-cooled housing weighs just 1.8 lbs, easy to toss in a truck or garage cabinet alongside boats, motorcycles, and lawn mowers.