Solar Car Battery Charger is the perfect solution for charging the batteries of motorcycles, automobiles, snowmobiles, tractors and more, which is not only environmental protection and energy saving, but also can maintain the battery lifetime, extending its usage life. It can also charge other 12V rechargeable batteries in emergency, suitable for vehicles in outdoor work or travel or camping training. Made of Monocrystalline silicon Glass fiber Laminated board, More better heat resistance, Faster generation, higher transfer efficiency output Lighter and thinner.This unit charges in all daylight conditions, even on cloudy days. Constructed with a built- in blocking diode to prevent reverse discharge, this solar panel is easy to install and completely maintenance-free. Just use the included alligator clips to connect it directly to the battery. In addition also applicable to other products of 12V or 18V input