Is a fully charged stereo a red or green light

Green light. Audio fully charged is a green light, generally speaking, the red light is to indicate that the charging, the green light indicates full. If it has been a red light (charging more than 3-5 hours or more) indicates that the speaker charging circuit has a problem, or simply do not have a fully charged self-stop function. If charging for 1 hour shows a green light that is full.