I tried one of my ''faulty'' 9Ah batteries and put it on charge yesterday, guess what- started taking charge as nothing happened ! I also have a 4Ah battery with the same issue and that wont play ball ! Faulty Milwaukee batteries show a sec long led pulse when pressing the charge meter button and putting them in the charger shows them as fully charged instantly ! I am a happy chappy, i have 3 working 9Ah batteries again !
When they are charging and it goes from 3 to 4 leds lit up. If you take the battery out and put it back the light will go green. The battery is not yet fully charged.