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I have a Dell Inspiron 5521 and have Ubuntu 13.10 on it. I noticed that my battery capacity reduced to 85.2%. Is there a solution for this? Thanks, Leo.

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  • can you run this command and post the results please --- upower -i /org/freedesktop/UPower/devices/battery_BAT0
    – Tasos
    Mar 27, 2014 at 9:03

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Since when?

If this is something that has always been the case in Ubuntu it could be that your have a wear-limiting feature enabled in your BIOS. Our Samsung laptop does this and we only get 80% of battery (but it has lasted 3 years without much drop in overall performance).

If the capacity is slowly dropping off, it could be that it's just losing capacity. This still happens with batteries; they have a lifespan where they slowly become less effective at holding charge.

And then there's the possibility it's a bug in the software that's reading the max charge and current charge. You can look at the rawer numbers with:

less /proc/acpi/battery/BAT0/state

If they don't correlate with what you know about the battery (it should have its capacity printed on the battery - you might have to take it out to see it), that might be your problem.

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