Plug-in, connect to the battery, select a charge mode, and start charging your battery. A fully-automatic, worry-free battery charger for year-round use. Designed for 6-volt and 12-volt lead-acid automotive, marine, and deep-cycle batteries, including flooded, gel, AGM, maintenance-free, and lithium-ion batteries.
Charges down from Zero Volts 
Can bring some batteries back from discharge
Offers Thermal Compensation by detecting temperature changes to adjust the charging in preventing over or under- charging
Offers Automatic Shut- Off so there is a guarantee of no over- charging