BatteryMINDer® 1500 is a SmarTECHnology(tm) plug 'n run 1.5 Amp battery charger/maintainer with full-time automatic pulse desulfator can help extend a battery's life up to 4 times its normal life. Ideal for charging, maintaining or recovering 12V flooded, sealed, maintenance-free, starter, deep-cycle, AGM and marine batteries. Automatic high-low temperature compensator is installed to ensure that batteries will never be overcharged or undercharged, regardless of the operating temperature. 0°F-130°F operating range. Unit can maintain up to 4 batteries at one time when connected in parallel. Has reverse polarity protection for safety.