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#!/bin/bash
### VARIABLES
POLL_INTERVAL=120 # seconds at which to check battery level
LOW_BAT=33 # lesser than this is considered low battery
# If BAT0 doesn't work for you, check available devices with command below
#
# $ 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
### END OF VARIABLES
kill_running() { # stop older instances to not get multiple notifications
local mypid=$$
declare pids=($(pgrep -f ${0##*/}))
for pid in ${pids[@]/$mypid/}; do
kill $pid
sleep 1
done
}
launched=0
# Run only if battery is detected
if ls -1qA /sys/class/power_supply/ | grep -q BAT
then
kill_running
while true
do
bf=$(cat $BAT_FULL)
bn=$(cat $BAT_NOW)
bs=$(cat $BAT_STAT)
bat_percent=$(( 100 * $bn / $bf ))
if [[ $bat_percent -lt $LOW_BAT && "$bs" = "Discharging" && $launched -lt 3 ]]
then
notify-send --urgency=critical "$bat_percent% : Low Battery!"
launched=$((launched+1))
elif [[ "$bs" = "Charging" ]]
then
launched=0
fi
sleep $POLL_INTERVAL
done
fi
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