For a very comprehensive output, without installing anything extra, open up a terminal window and enter:
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upower -i /org/freedesktop/UPower/devices/battery_BAT0
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sudo apt-get install acpi
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acpi
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Battery 1: discharging, 44%, 00:18:48 remaining
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acpi -t
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Battery 1: discharging, 37%, 00:15:59 remaining
Thermal 1: ok, 49.0 degrees C
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acpi -t -f
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acpi -a
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Battery 1: discharging, 30%, 00:13:31 remaining
AC Adapter 1: off-line
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acpi -V
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Battery 1: discharging, 27%, 00:11:29 remaining
Thermal 1: ok, 50.0 degrees C
AC Adapter 1: off-line