Charge and maintain your vehicle's battery with the sun. Once connected, this Battery Tender® Battery Charger will charge and maintain your battery so it's always ready to go when you are. Lightweight, fully-automatic, and easy to use, the Battery Tender® Solar Panels are the only panels available with a built-in charge controller to prevent overcharging.MOUNTABLE & VERSATILEEasily mount to outdoor surfaces with 4 included mounting holes.  Harness and regulate solar energy in areas without power access    SMART CHARGINGPrevent overcharging and battery discharging with the controller's 3-step charging process.  LED indicator light displays current charging status    VERSATILEThis compact solar panel is compatible with lithium (LifeP04), lead acid, flooded, and sealed maintenance-free AGM and gel cell batteries    PROTECTEDIP67 rated weather resistant with spark proof and reverse charging protection; comes with a 5-year manufacturer limited warranty and lifetime customer supportCalifornia Residents WARNING: Cancer and Reproductive Harm - P65Warnings.ca.gov.