Battery information in Linux is provided by the ACPI (Advanced Configuration and Power Interface) daemon which is installed by default in most Linux distributions. Monitored battery information is stored in the /sys filesystem.

You can view your battery information by viewing the content of the files in the battery section of the /sys filesystem or by using userland applications such as upower or acpi.

Battery information in /sys filesystem, upower or acpi can be viewed from the terminal in Linux.

Step-by-step video guide:

Steps to view detailed battery information in Linux:

  1. Launch a terminal application.
  2. View available battery informations in /sys filesystem.
    $ ls /sys/class/power_supply/BAT0/
    alarm           charge_full_design  device        present        technology          voltage_now
    capacity        charge_now          manufacturer  serial_number  type
    capacity_level  current_now         model_name    status         uevent
    charge_full     cycle_count         power         subsystem      voltage_min_design
  3. View battery informations from any of the files.
    $ cat /sys/class/power_supply/BAT0/capacity
  4. View battery details using upower.
    $ upower -i /org/freedesktop/UPower/devices/battery_BAT0
      native-path:          BAT0
      vendor:               Samsung SDI
      model:                DELL TXF9M6C
      serial:               34075
      power supply:         yes
      updated:              Fri 05 Jul 2019 11:27:48 AM +08 (91 seconds ago)
      has history:          yes
      has statistics:       yes
        present:             yes
        rechargeable:        yes
        state:               fully-charged
        warning-level:       none
        energy:              54.0968 Wh
        energy-empty:        0 Wh
        energy-full:         54.0968 Wh
        energy-full-design:  61.9932 Wh
        energy-rate:         0 W
        voltage:             8.504 V
        percentage:          100%
        capacity:            87.2625%
        technology:          lithium-polymer
        icon-name:          'battery-full-charged-symbolic'
  5. Install acpi userland application.
    $ sudo apt update && sudo apt install --assume-yes acpi # Ubuntu and Debian

  6. View battery charge information using acpi.
    $ acpi
    Battery 0: Full, 100%
  7. View detailed battery information using acpi.
    $ acpi --battery --details
    Battery 0: Full, 100%
    Battery 0: design capacity 8157 mAh, last full capacity 7118 mAh = 87%
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