2 Amp Battery Maintainer - Professional Quality Battery Charging; Charges and Maintains 6 Volt and 12 Volt Batteries without Overcharging; Safely Charges 12 Volt Lithium Ion Batteries; Automatically Reconditions Damaged Batteries; Multi-stage Charging for Optimal Battery Performance; Voltage Detection Automatically Selects the proper Voltage for your battery; IP65 Weatherproof construction is ideal for outdoor use.