bought one of these about 3 weeks ago (to test) and its amazing, charges up most batteries in minutes, average time is about 15-20 minutes for me.
chargers AA and AAA batteries
fan turns off when batteries are finished charging.
For AA red light means charging, green light means finished.
For AA red light means charging, flashing red light means finished.
If you put a battery in that doesnt need charging the RED LED will flash