This solar battery charger and maintainer will maintain 12V lead-acid batteries where A/C power is not readily available. Unit safely charges wet cell, gel cell, AGM, or any maintenance-free battery. It provides up to 180mA of trickle current directly from the sun to counteract the parasitic drains of most vehicles, boats, RVs, and more. Its ultra-low profile design makes it simple and easy to install. Completely weatherproof for outdoor use, the charger works well, even in cloudy, overcast conditions. Protects against back-current drain at night. Rated at IP65 specifications.