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I would like a command that check the battery status through the terminal

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10 Answers 10

The below command outputs a lot status and statistical information about the battery. The /org/... path can be found with the command upower -e (--enumerate).

upower -i /org/freedesktop/UPower/devices/battery_BAT0

Example output:

  native-path:          /sys/devices/LNXSYSTM:00/device:00/PNP0C0A:00/power_supply/BAT0
  vendor:               NOTEBOOK
  model:                BAT
  serial:               0001
  power supply:         yes
  updated:              Thu Feb  9 18:42:15 2012 (1 seconds ago)
  has history:          yes
  has statistics:       yes
  battery
    present:             yes
    rechargeable:        yes
    state:               charging
    energy:              22.3998 Wh
    energy-empty:        0 Wh
    energy-full:         52.6473 Wh
    energy-full-design:  62.16 Wh
    energy-rate:         31.6905 W
    voltage:             12.191 V
    time to full:        57.3 minutes
    percentage:          42.5469%
    capacity:            84.6964%
    technology:          lithium-ion
  History (charge):
    1328809335  42.547  charging
    1328809305  42.020  charging
    1328809275  41.472  charging
    1328809245  41.008  charging
  History (rate):
    1328809335  31.691  charging
    1328809305  32.323  charging
    1328809275  33.133  charging

You could use tools like grep to get just the information you want from all that output.

One simple way: piping the above command into

grep -E "state|to\ full|percentage"

outputs:

state:               charging
time to full:        57.3 minutes
percentage:          42.5469%

If you would often like to run that command, then you could make a Bash alias for the whole command. Example:

alias bat='upower -i /org/freedesktop/UPower/devices/battery_BAT0| grep -E "state|to\ full|percentage"'

Add that to the end of your .bashrc file, and you can type 'bat' any time, in the terminal.

There is also a upower -d (--dump) command that shows information for all available power resources such as laptop batteries, external mice, etc.

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upower --enumerate can be useful if you are not sure how to use upower. –  landroni Feb 19 at 21:50
    
@landroni And the shorthand option is upower -e, that command lists the available paths for upower -i .... If you are lazy and just want a list of all devices, use upower -d (upower --dump). –  Lekensteyn Feb 20 at 8:57
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Indeed. I think this would be a useful addition to the answer itself, as when I first tried to use upower I immediately got lost. –  landroni Feb 20 at 9:50
    
@landroni Good point, I have updated the answer. Feel free to edit it if you have more related additions. –  Lekensteyn Feb 20 at 23:41
    
Your edits look great. Thanks. –  landroni Feb 21 at 7:19
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A friendly reminder: since 2.6.24 using /proc to store ACPI info has been discouraged and deprecated. Now it is in /sys/class/power_supply/BAT0.

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Maybe you can try:

cat /proc/acpi/battery/BAT0/state

cat /proc/acpi/battery/BAT0/info

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using /proc to store ACPI info has been discouraged and deprecated since 2.6.24. Now it's in /sys/class/power_supply/BAT0. –  Terry Wang Jun 17 '13 at 8:34
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Run the following command in a terminal for getting detailed info:

cat /proc/acpi/battery/BAT0/info

If you just want the state do:

cat /proc/acpi/battery/BAT0/state
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Yes, it worked :) Thanks! –  infoquad Apr 19 '11 at 12:22
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I was going to suggest acpi but after reading it's not working in 11.10, I had an idea.

Please type this in your terminal: ls /proc/acpi/battery/BAT0 or BAT1

If you get a "file or directory not found" then this isn't going to work.

But, if it lists files, then here's a script [paste it into /usr/games/ or other directory in $PATH, and run sudo chmod +x /usr/games/batterypercent, or whatever you name it] that I just wrote for you that will give you an estimate battery percentage [See below]:

(Note, if not already installed, install the program calc from the repo: sudo apt-get install apcalc)

#!/bin/bash
math() { calc -d "$@"|tr -d ~; }
cd /proc/acpi/battery/BAT0;
max=$(grep 'design capacity:' info|awk '{print $3}')
current=$(grep 'remaining capacity:' state|awk '{print $3}')
percent=$(math "($current / $max) * 100");
echo $(echo $percent|cut -d. -f1)%

I have tested this script on my laptop. I say estimate above because acpi shows 93% battery, and my script shows 90% battery, so try this script against your GUI battery percentage, and see how off it is. In my case, it seems to be consistently 3% lower than acpi's percentage. In that case, you can add this line right before the last line: percent=$((percent + 3)), where "3" is the percentage it's low by.

**In my lenovo, the battery is listed as BAT1, try that too. (12.04 LTS)

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Matt, tried your suggestion, got a "No file or directory" –  Joe Oct 20 '11 at 13:41
    
Argh.. okay, I'm almost positive this is why acpi doesn't work, because I guess 11.10 doesn't support your laptop's ACPI functions as well [battery, etc]. I think I've experienced something like this when upgrading in the past. I'm still on 11.04 though. Sorry that this didn't work for ya :( –  Matt Oct 20 '11 at 15:36
    
So, just curious, can you paste the output of ls /proc/acpi/ ? Thanks –  Matt Oct 20 '11 at 15:41
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First install acpi by running this command,

sudo apt-get install acpi

Then run,

watch --interval=5 acpi -V

Output:

Every 5.0s: acpi -V                                     Wed Jan  8 15:45:35 2014

Battery 0: Full, 100%
Adapter 0: on-line
Thermal 0: ok, 44.0 degrees C
Thermal 0: trip point 0 switches to mode critical at temperature 127.0 degrees C
Thermal 0: trip point 1 switches to mode hot at temperature 127.0 degrees C
Cooling 0: intel_powerclamp no state information available
Cooling 1: pkg-temp-0 no state information available
Cooling 2: LCD 100 of 100
Cooling 3: LCD 100 of 100
Cooling 4: Processor 0 of 10
Cooling 5: Processor 0 of 10
Cooling 6: Processor 0 of 10
Cooling 7: Processor 0 of 10
Cooling 8: Processor 0 of 10
Cooling 9: Processor 0 of 10
Cooling 10: Processor 0 of 10
Cooling 11: Processor 0 of 10
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Install acpi, then use watch to continously monitor thru command line.

E.g.

watch --interval=5 acpi -V

will show the information such as below and will update every 5 seconds.

Battery 0: Full, 100%, rate information unavailable
Battery 0: design capacity 6000 mAh, last full capacity 3424 mAh = 57%

Question is why would someone do this? Well, I have a laptop with broken LCD screen that I am now using as my bittorrent box.

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cat /proc/acpi/ac_adapter/AC/state
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not sure what you're talking about here. running it in the terminal gave cat: /proc/acpi/ac_adapter/AC0/state: No such file or directory –  infoquad Apr 19 '11 at 12:06
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Thanks to @Wilf this works on my Ubuntu 14.04 on Lenovo Yoga 2 Pro:

upower -i $(upower -e | grep BAT) | grep --color=never -E "state|to\ full|to\ empty|percentage"

Output:

state:               fully-charged
percentage:          100%

Or just the numeric value with this one liner

upower -i $(upower -e | grep BAT) | grep --color=never -E percentage|xargs|cut -d' ' -f2|sed s/%//
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I'm a little late to the party but here's my little contribution. Based on the previous answers , I have made a simple script batpower:

#!/bin/bash
# Description: Battery  charge in percentage

cat /sys/class/power_supply/BAT1/uevent | grep  POWER_SUPPLY_CAPACITY

The output for executing this ( ./batpower ) is going to be something like this:

POWER_SUPPLY_CAPACITY=23

N.B. : the batery number may be different for you, in my case it is BAT1, but you can always find it out by cd'ing to /sys/class/power_supply or as Lekensteyn mentioned through upower -e

My machine : Ubuntu 13.10 , 3.11.0

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