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  • Actually the lower its charge level, the longer it will last. Assuming a constant temperature. However, laptop batteries will have some electronics in them to monitor the health of the battery, these electronics are a constant (although very small) drain on the battery. If you let it get too low then the electronics will prevent the battery from being changed because of the risk of fire.
    – pipTheGeek
    Commented Sep 6, 2010 at 11:41