only 1 of my attys works on eather of the batteries, so i thought it was just the atty, but i went to charge the problem battery i left it charge for like 3 or 4 hours and still the red light was on, the atty did work but had to screw it all the way on, then unscrew it 3/4 of a turn. some1 said to clean the white ring on it, but how can i its a tight space to stick anything in there, but when i look at the threads on the battery and have brown stuff on it, but dont know how to clean it, and im not even sure if this is the issue, the atty is only 4 or 5 days old, so it cant be dead yet right?