My mom's got an Acer Aspire 8920g The battery was dead and wouldn't hold a charge at all, it was tethered to the charger basically and yanking it out would instantly kill the laptop I bought a compatible replacement battery off ebay The laptop works without having to be in the charger rn. BUT in Windows 7 the notification bar shows an empty battery icon with a red 'x' and a power cord. Hovering over it shows 'No battery is detected', even when it's not in the charger Basically the battery functions as normal only the OS doesn't recognise it. So I can never tell how much %age is left, and it just spontaneously dies when it's empty. So far what I've tried is updating the BIOS, uninstalling the driver under Device Manager so that Windows would re-install it, and I've tried taking out the battery and unplugging it then holding the power button for 20 seconds then putting the battery back in and booting it. No dice. Any ideas?