Schumacher Electric 4.8W Solar Car Battery Maintainer, Amorphous Solar Technology, Water Resistant, 12V Sport, Auto, and Marine Batteries, SP-400

RELIABLE CHARGE: Delivers a 4.8-Watt charge to 12V car, boat, motorcycle, snowmobile, truck and RV batteries SOLAR-POWERED: Water-resistant solar panel battery maintainer utilizes solar technology to convert sunlight into power compatible with lead-acid batteries NO ELECTRICITY NEEDED: Charge the maintainer by placing it panel-side up in an area exposed to daylight works in both sunny and cloudy conditions EASY TO USE: Simplified, environmentally-safe design offers plug-and-play usability and requires minimal maintenance