Re: Dell Studio 1555 Battery Failure
If it says 90W, which means that there is nothing wrong with your Motherboard or AC Adpt.
Try updating the application 'QuickSet' on your system.
Follow these steps :
1) Go to Add/Remove programs, uninstall QuickSet. Restart your system.
2) Go to support site for Studio 1555 applications. Click here to go there now. (Make sure you choose the correct OS)
3) Install QuickSet and restart the system.
4) Even after reinstalling if you face the same problem, Update BIOS from the same link.
5) If still the problem persists, i am afraid you mite have to buy a new battery.