For use with Hydrastar XL and Electrastar. It is easy to install, easy to access, and built to take the weather and shock of trailer life. Also, it is ideal for other systems requiring a higher amp/hr battery. The new molded box is made of weather and shock-resistant glass-filled nylon. The kit also includes a 12v-17amp, sealed lead acid battery requiring no maintenance, and a break-away switch.