How to show the battery level of your Bluetooth mouse in the shell

by Hund | July 21, 2021

UPower is an abstraction for enumerating power devices, listening to device events and querying history and statistics.

It comes with a command-line client called upower, which makes it possible to check the status of your device via the shell. I have a wireless mouse called Logitech G305 and this is the output I get with upower --dump:

$ upower --dump
Device: /org/freedesktop/UPower/devices/mouse_hidpp_battery_0
  native-path:          hidpp_battery_0
  model:                G305 Lightspeed Wireless Gaming Mouse
  serial:               4074-61-97-4e-4d
  power supply:         no
  updated:              Wed 21 Jul 2021 12:07:44 PM CEST (4 seconds ago)
  has history:          yes
  has statistics:       yes
  mouse
    present:             yes
    rechargeable:        yes
    state:               fully-charged
    warning-level:       none
    battery-level:       full
    percentage:          100% (should be ignored)
    icon-name:          'battery-full-charged-symbolic'
  History (charge):
    1626862064	100.000	fully-charged

Daemon:
  daemon-version:  0.99.11
  on-battery:      no
  lid-is-closed:   no
  lid-is-present:  no
  critical-action: PowerOff

If I have multiple devices and would like to only show information about my mouse, I can then use the flag -i, --show-info like this:

$ upower -i /org/freedesktop/UPower/devices/mouse_hidpp_battery_0

And if I just want to print the battery percentage:

$ upower -i /org/freedesktop/UPower/devices/mouse_hidpp_battery_0 | grep "percentage" | awk '{print $2}'
100%

How to show the battery level of your Bluetooth mouse in the shell

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