Battery Life Saver BLS-48A 48v Battery System Desulfator Rejuvenator For use with 48 volt renewable energy battery systems or battery power vehicles. Use model BLS-48B for 48 volt golf cards Can extend battery life two to three times by removing and preventing the accumulation of lead sulfate crystals using patented square sine technology Rejuvenates old weak batteries. Maintains new batteries in optimal condition. Prevents slowdown. Restores power and performance to any electric motorized vehicle. From golf carts to trolling motors, you'll regain lost performance. Easy to use. Just connect it and forget it. Just 2 wires to connect. Ideally mounted full time to constantly keep the batteries in optimum condition. The system should be charged regularly.The battery itself powers the device