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E7470 - Wrong battery calibration


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I have an issue with the estimated remaining battery indication of my hackintosh. When I reach 0% of battery (indicated in the status bar), the laptop can continue to work maybe 20 or 30 minutes more. I did not have this issue with windows : when it reached 5% or less, the laptop was shutted down. 

Is it a calibration issue of the hackintosh ? How to get rid of this problem and retrieve a realistic remaining battery indicator ?



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