Port #1 charges all DeWalt 12V to 20V MAX lithium ion batteries (except Univolt batteries). Port #2 charges all DeWalt 7.2V to 18V NiCd (nickel cadmium)/NiMH (nickel-metal hydride)/(lithium ion batteries). Charges batteries in 1 hour or less. Diagnostics with LED (Light Emitting Diode) indicator communicates battery charge status: Charged, charging, power line problem, battery too hot or too cold, and problem pack or charger. Tool weight: 3.0 lb (pound).