A true multi-tasker, the DEWALT DXAEC100 Professional 30 Amp Battery Charger and Battery Maintainer is the high efficiency solution for 12-Volt WET, GEL and AGM batteries. It provides a powerful 100 amp engine start, 30 Amp of charging and 3 Amp maintainer. The alternator check tests the vehicle's alternator to indicate if it is operating properly. Electric pulse technology can help reverse sulfate build up on battery plates to improve charge capacity and extend battery life. Built-in reverse polarity protection.. 30A Battery Charger restores energy. 3A Car Battery Maintainer keeps battery at optimal charge level. Compatible with WET, AGM and GEL 12V batteries. Amperage (A): 30 A. Charger type: AC. Features: Reverse Polarity Protection. Pack Size: 1. Product Weight (lb.): 7 lb. Voltage Output (volts): 12 V. Product Height (in.): 10 in. Product Width (in.): 4 in