Battery light wont go off when charge is done

I just bought a new battery for my delll inspiron b130 off of ebay. They battey holds a charge and last around 3 hours, the problem is when the computer says the battery is full, the light on the computer still flashes indicating it is still charging. I know this is normal for a short period of time, but it has done this for several hours after the charge was complete. I have the Battery Care software installed and it says the the battery isn't being drained or charged. The battery holds 53wh, and Battery Care shows it as having 47844mwh of power when charged. What is going and and is it ok the leave the battery in with the light flashign?