Low battery warning by audio and notification for macos laptops

powerchange.sh

#! /usr/bin/env sh
# When battery has less than 25%, pops up notifier counting down integer % of battery left 24, 23, 22, 21 ... 
# When battery is less than 15% also announces "Low Battery" verbal warning.
# INSTALL: Put this powerchange.sh file in /Users/Shared/ folder on your mac laptop, then chmod a+x *.sh
# And put com.me.powerchange.plist (below) in ~/Library/LaunchAgents/ (or /Library/LaunchAgents/ for every user).
# This file is run by com.me.powerchange.plist whenever charger is disconnected 
# When charger is unplugged, the date of this file changes: Library/Preferences/com.apple.powerlogd.plist
## https://stackoverflow.com/questions/14108471/launchd-watchpaths-will-not-trigger-simple-hello-world-script-os-x-10-8

## See also https://github.com/Goles/Battery/
export PWRINFO=$(ioreg -l | grep ExternalConnected)
export BATT_PCT=$(pmset -g batt | grep -o '[0-9]*%' | tr -d %)
echo -e $PWRINFO ' \t' " % "   $BATT_PCT  | logger -i -t batmom -s   2>> /var/log/batmon.log 
if [[ $BATT_PCT -lt 25 ]]; then
  echo $PWRINFO $BATT_PCT "%" | /usr/local/bin/terminal-notifier 
	if [[ $BATT_PCT -lt 15 ]]; then
		echo "Low Battery  " $BATT_PCT "%" | say	
	fi
fi
#echo $PWRINFO $BATT_PCT "%" 

exit 0

It's just a quick-and-dirty way I used to keep an eye and ear on battery state when I was having problems with zoom eating up battery.