Charger Batt 18V Ni-Cad/Li-Ion Charges any PC slide pack NiCad or Lithium Ion battery. Hot pack indicator prevents damage to the battery by preventing charging when pack is hot. Bad pack indicator notifies user if battery is defective and needs replacement. Charges NiCad packs in 45 mi n, 1P LX lithium packs in 30 min, and 2P EX lithium packs in 1 hour. Thermal protection.