Hello. I just purchased a new battery for my Dell Inspiron 600m laptop. It came to me with a 20% charge and it won't charge up any more. It does work, I can unplug the charger and use the battery's power, but no matter what I try it just won't charge. Dell isn't giving me any help either. The charger is putting out the correct voltage. Also at work we have a Dell Inspiron 7000 with the same issue. Are Dell laptop batteries just sh*t? I heard something about counterfeit batteries. Any way to tell if this is one?