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Could just be a battery calibration problem... like the battery is still holding two hours worth of charge, but it "thinks" it only has 30 minutes...
It's possible to recalibrate it... what you have to do is disable all the low power actions so that it doesn't automatically shut down or hibernate when it thinks there's 5% power left.
Charge it up completely, and then just let it run until it actually runs out of battery... and it's best to repeat this a couple times.
It's not guaranteed to work, but it does in many cases.
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