PulseTech SolarPulse 5WT Maintainer, Black/Blue Restores and maintains the normal loss of 12-volt lead-acid battery power on seldom used outdoor vehicles and equipment Higher efficiency, higher quality crystalline silicone cells pack more power per square inch Longer life than standard amorphous "thin film" solar cells Sturdier smaller sized solar panel Plastic coated panels are virtually indestructible and impervious to weather and age