My acer laptop battery is not working it shows 98% but after using it for few mi

Hello,
my acer laptop battery is not working properly it shows 98% and it show only 26 minutes but after using it for few minutes its goes down to 10% before it was not like this it used to show 2 hrs or more again i charge it goes to 100% in around 45 minutes but after that the same problem please help me
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  1. It's probably a sign that the battery is on its way out. However, have you recently updated to Windows 7 though?
  2. hello
    no i havn't updated to window 7 my laptop window is xp :??:
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