Problem with macbook air battery

  Joanna12 15:36 20 Feb 16
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Hello, I am a new user of a macbook air and I have a problem with the battery. My laptop's battery was able to last for at least 10h but about a week ago I noticed that the fully charged battery lasts only for about 4 hours. I have no idea why the sudden change, if it's maybe something I'm doing without realising, but I would really appreciate any ideas or advice

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