Does it say "plugged in, not charging" when you move the mouse over the battery icon in the bottom right corner? If so its probably a stupid bug with the Microsoft ACPI manager. Go to device settings and under battery, remove "Microsoft ACPI compliant control battery" remove anything else you can under battery as well. Shut the laptop down. Remove the battery. Hold the Power key for a minute. Then replace the battery and power up. When Windows starts it should restore the drivers and charge the battery properly. Also... like Beatminister said, a 5 year old battery probably isn't that good anyway. Don't waste your money on a charger.