Deltran 12V 5-Amp Battery Tender Waterproof Power Tender Plus: * Waterproof * Shock and vibration resistant * Lightweight and compact * Designed for either portable operation or permanent mounting * Charges and maintains both flooded and sealed, maintenance-free, AGM, lead acid batteries * Float/maintenance function maintains batteries at proper storage voltage * Easy to use * Microprocessor controlled * BTP technology * Charges any size (capacity) lead acid battery * Reverse polarity protection * 2-year warranty