Out of frustration from some-battery-monitor-util sometimes missing the moment to notify me about low charge, this simple script was put together.
It checks the current status and level of the BAT0 device and does one of the following:
- notify about low battery level (15%)
- notify about critical battery level (5%)
- notify about near-zero battery level (3%), wait a couple of seconds and hibernate if battery status haven't changed to
Charging
Requisites:
- some notification daemon (I like
dunst) -
systemdfor hibernation - something, that calls that script periodically (I call it with
polybarevery 60 seconds)
The script itself (battery-notifier.sh):
#!/usr/bin/env bash
LOW_LEVEL=15
CRITICAL_LEVEL=5
HIBERNATE_LEVEL=3
LEVEL=$(cat /sys/class/power_supply/BAT0/capacity)
STATUS=$(cat /sys/class/power_supply/BAT0/status)
hibernate() {
notify-send -a "Battery" "Hibernating!" -u critical
# Give some time to plug the power in
sleep 5
# Hibernate if still discharging
STATUS=$(cat /sys/class/power_supply/BAT0/status)
if [[ "$STATUS" = "Discharging" ]]; then
systemctl hibernate
else
notify-send -a "Battery" "Power was plugged in. Hibernation is cancelled!"
fi
}
notify_critical() {
notify-send -a "Battery" "Battery is critically low!" -u critical
}
notify_low() {
notify-send -a "Battery" "Battery is low!"
}
if [[ "$STATUS" = "Discharging" ]]; then
if [[ "$LEVEL" -le "$HIBERNATE_LEVEL" ]]; then
hibernate
elif [[ "$LEVEL" -le "$CRITICAL_LEVEL" ]]; then
notify_critical
elif [[ "$LEVEL" -le "$LOW_LEVEL" ]]; then
notify_low
fi
fi
The polybar module config:
[module/battery_notifier]
type = custom/script
exec = ~/.config/polybar/battery-notifier.sh
interval = 60
* Notice, that script is put to ~/.config/polybar/.