I have a 3 year old core 2 duo based laptop by Lenovo. windows 8.1 works perfectly well in the 4 GB ram system. The only issue i am facing is about the battery notification. Whenever I charges the laptop, it shows charging but the level doesn't seem to change even after charging for hours. I connect the laptop to my Staticon inverter, which I am doing for past couple of years. The laptop still has a backup of about 1 hour although the level shows battery level is low. I am not sure if it is a bug in windows 8.1 or a battery issue. Can someone help me how to rectify this issue?