Score:0

The esstimated time to empty is not correct and keeps changing

au flag

At 100%, it said that the battery should last for 2 and a half hours. The laptop has been running for 3 and a half hours and still running.

The battery percentage is was changing between 6% to and 7%, sometimes 10%, so it isn't accurate.

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Is this normal, or should I be worried?

cn flag
Hardware problem: it is your system giving out wrong info. All Ubuntu (or any OS) gets the max and current levels from the BIOS. If it is a new install the system also needs a bit of time to calibrate. Plus that 100% is based of a specific performance. If you have it on balanced and (automatically) switch to power saving the 100% is based of different situations ;-)
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