A:Answer While plugged in to charge, a red light is on at the spot where the charger cord plugs in on the flashlight. When fully charged, the red light now is green. My 700Tac is charged in about 2 hours. A full charge will last about 4 hours. When the charge is gone, it shuts off suddenly (there is no warning), so I do need to be aware of how much time is used.