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It's about some months that I have a strange problem with my laptop battery. In the past, whenever my laptop went about 10% of battery, my operating system Windows 8 showed a notification alarm to inform me about powering off. But it's some months that this just happens a few times and most of the time, my laptop powers off during my works without any alarm about running out of battery.
What do I have to do ? What does this problem for ?

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Maybe your battery is getting old – Ashtray Jul 19 '13 at 5:47
How can I determine it ? – Mohammad Bagher Saberi Jul 19 '13 at 9:37

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