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The Battery Tender 4 Amp Power Tender from has a selectable 12 volt or 6 volt options for Flooded/AGM batteries and a selectable 12 V Lithium LiFePO4 setting for Lithium LiFePO4 batteries. It’s lightweight compact and fully automatic very easy to use especially in small spaces. It will keep your battery fully charged so that it is ready to go when you are! Battery Tender chargers from are completely automatic and may be left connected to both AC power and to the battery that it is charging for long periods of time. The charger output power voltage and current depends on the condition of the battery it is charging. Battery Tender chargers have several status LED indicators that provide a visual means to determine the operating mode of the charger and hence the condition of the battery connected to the charger. The E-Z quick disconnect ring harness allows you to leave the charging wiring attached to the battery while operating the vehicle. Battery Tender Plus will not overcharge or boil battery when connected long term.