Xcellent Global 12V 8.5W Portable Solar Car Charger Boat Power Solar Panel Battery Charger Maintainer for Automobile Tractor Boat Batteries, AT003 Keep your battery topped up with solar power, even if the weather is overcast or dull, Matain the car battery Ideal for your cars when you are outside for traning or travelling. Make it convenient to charge your phone and the other electronic products with USB port when you did not find your charger. Built-in blocking diode to prevent reverse discharge Interchangeable connectors: car charger cigarette lighter plug, clips line, 5V DC USB output connector Ideal for cars, caravans, boats, motorcycle, tractor or any 12v Lead Acid Battery