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Can't hurt to do some battery calibration...
What you have to do is disable all the power management actions... as in don't let the laptop go to sleep or hibernate when it gets down to x% battery left. Disable all of those.
Charge the laptop up as high as possible, then unplug it and let it run into it actually turns off from no more battery. Then plug it back in and let it charge back up to full capacity again before turning the laptop back on.
This can help to get your system battery status back in sync.
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