Dual Port charges batteries in 1 hour or less. Port 1 charges all Dewalt 12V - 20V MAX Li-Ion batteries. Port 2 charges all Dewalt 7.2V - 18V NiCd/NiMH/Li-Ion batteries (except univolt batteries). Diagnostics with LED indicator communicates battery chargestatus: charged, charging, power line problem, battery too hot or too cold and problem pack or charger. Weighs 3 lbs.