With Schumacher Electric’s SP-200 12-Volt 2.4-Watt Solar Battery Maintainer Two-Pack Bundle, you can harness the power of the sun to trickle charge two 12-Volt batteries at the same time. These solar battery maintainers are ideal for extending the battery life of 12-Volt lead-acid batteries and can be used to maintain the battery of your boat, car, motorcycle, snowmobile, truck, RV, and other vehicles. Each water-resistant solar panel utilizes amorphous solar technology, which even works in cloudy conditions. Both panels can be mounted in a variety of places for easy access.