56-353 CTEK Multi US 7002 Battery Charger. Compact and light weight, this battery charger does it all AUTOMATICALLY. As well as automatically handling all your charging needs, the 7002 also offers a self contained power supply that will charge 12 Volt Batteries even when it is not plugged in. Chargers all lead-acid batteries and includes a 4 step pulse maintenance charge to increase battery life and give superb performance. This little battery charge is so powerful that it will even charge completely dead batteries. Perfect for storing your Corvette.