Odd Battery Problem

[390E77]

Hi. I have a Thinkpad 390E and i have just bought a new battery. When i slide it into the laptop the orange indicator lights up and the tray icon indicats that it is charging. However, after a few seconds the orange light shuts off but the tray icon still tells me the battery is charging. It has been on 2% (charging) for many hours now. Can anyone help me?

Thanks,
390E77