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#!/bin/bash
### VARIABLES
POLL_INTERVAL=120 # seconds at which to check battery level
LAST_NOTIFIED=-1 # track last notified battery percentage to avoid repeated notifications
# If BAT0 doesn't work for you, check available devices with:
# $ ls -1 /sys/class/power_supply/
BAT_PATH=/sys/class/power_supply/BAT0
BAT_STAT=$BAT_PATH/status
if [[ -f $BAT_PATH/charge_full ]]; then
BAT_FULL=$BAT_PATH/charge_full
BAT_NOW=$BAT_PATH/charge_now
elif [[ -f $BAT_PATH/energy_full ]]; then
BAT_FULL=$BAT_PATH/energy_full
BAT_NOW=$BAT_PATH/energy_now
else
exit
fi
kill_running() {
local mypid=$$
local pids
mapfile -t pids < <(pgrep -f "${0##*/}")
for pid in "${pids[@]}"; do
if [[ $pid -ne $mypid ]]; then
kill "$pid"
sleep 1
fi
done
}
get_battery_icon() {
local percent=$1
if ((percent > 80)); then
echo "🔋" # Full battery
elif ((percent > 60)); then
echo "🔋" # High battery
elif ((percent > 40)); then
echo "🔋" # Medium battery
elif ((percent > 20)); then
echo "🪫" # Low battery
else
echo "⚠️" # Critical battery
fi
}
# Run only if battery is detected
if ls -1qA /sys/class/power_supply/ | grep -q BAT; then
kill_running
while true; do
bf=$(cat "$BAT_FULL")
bn=$(cat "$BAT_NOW")
bs=$(cat "$BAT_STAT")
bat_percent=$((100 * $bn / $bf))
bat_icon=$(get_battery_icon "$bat_percent")
# Notify only at exact levels: 20%, 15%, and 10%
if [[ ($bat_percent -eq 20 || $bat_percent -eq 15 || $bat_percent -eq 10) && "$bs" = "Discharging" && $bat_percent -ne $LAST_NOTIFIED ]]; then
notify-send --urgency=critical "$bat_icon $bat_percent% : $([[ $bat_percent -eq 10 ]] && echo 'Critical Battery! Shutting down in 1 minute...' || echo 'Low Battery!')"
LAST_NOTIFIED=$bat_percent
if [[ $bat_percent -eq 10 ]]; then
sleep 60
shutdown now
fi
elif [[ "$bs" = "Charging" ]]; then
LAST_NOTIFIED=-1
fi
sleep "$POLL_INTERVAL"
done
fi
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