The BLSOLAR2 is a 2.5-watt solar battery charger and maintainer for maintaining 12-volt lead-acid batteries where A/C power is not readily available. It provides up to 180mA of trickle charging current directly from the sun to counteract parasitic drains of most vehicles, such as cars, boats, trucks, motorcycles, ATVs, RVs, lawn mowers, and more. Its ultra-low profile design makes it simple and easy to install, and completely weatherproof for outdoor use.