Battery Notifier 🔋

This is a simple application to show current battery status (percentage and charging status). It can also watch the battery continuously and send periodic desktop notifications when the battery goes below a threshold percentage.

Development

Clone https://github.com/meysampg/battery_notifier and run go mod vendor.

Options 👷

• -v: show application version.

• -t: battery percentage threshold, below which the battery will be condiered as low and the user will start getting desktop notifications about low battery.

• -l: battery check interval during low (< threshold) battery.

• -n: battery check interval during good/normal (> threshold) battery.

• -w: continuously watch battery level at preset interval. The interval depends on values of '-n' and '-l'.

• -p: show the remaining percentage of the battery and exit.

• -h: get help message and default values of flags/options.

Creating a Systemd Service to keep watching battery even across reboots

• Copy the executable to /usr/local/bin/

• Create a systemd service unit file like below:

$ cat /lib/systemd/system/battery-notifier.service 
[Unit]
Description=System Battery Monitor and Notifier
After=multi-user.target

[Service]
User=<normal system username but not root>
ExecStart=/usr/local/bin/battery_notifier -w
Restart=on-failure
RestartSec=30s

[Install]
WantedBy=multi-user.target

• Save the above file and perform the following to always start the battery-notifier service:

$ sudo systemctl daemon-reload
$ sudo systemctl start battery-notifier
$ sudo systemctl enable battery-notifier