The Battery Tender Plus weighs only 2.7 pounds, making it ideal for the trunk, the boat, or even your motorcycle. It is waterproof, shock resistant, and vibration resistant so it can withstand rough waters or off-roading. Take it with you so you can charge your battery anywhere there is an AC outlet. The Battery Tender charges any size, flooded or sealed maintenance-free lead acid batteries. The float mode maintains the proper voltage of a battery at all times, without the damaging effects of trickled chargers. The reverse polarity protection keeps you from damaging the charger by incorrectly attaching the alligator clamps. The BatteryTender Plus is compact, easy to use, and incredibly durable. Keep all your batteries alive and well with the Battery Tender Plus. Temperature compensated to ensure optimum charge voltage according to ambient temperature. Automatically switches from full charge to float charging mode. Battery Tender at 1.25 amps will charge as fast or faster than any 3 amp charger available. Reverse Polarity Protection to ensure user safety. Complete 3-step charging program (Bulk Charge, Absorption Mode, Float Mode). 10 year Warranty!