Xantrex 804-1220-02 TRUECharge2 12-volt 20A Battery Charger, Microprocessor-controlled, multistage charging algorithms, Settings for two and three-stage charging, Settings for flooded, gel, AGM or lead-calcium batteries, Auto-ranging universal input voltage (90-265 Vac, 47-63 Hz) is also compatible with a generator or other low-quality power sources, UPC 687873007710, Temperature-compensated charging, Power factor corrected for efficient charging, Battery-equalization feature, Ability to charge dead batteries, Reverse battery polarity protection, Drip-proof design, Over and under-temperature protection, DC over-voltage protection, Battery overcharging protection.