#!/bin/sh

for battery in /sys/class/power_supply/BAT?*; do
    status=""
    case "$(cat "$battery/status" 2>&1)" in
		"Full") status="=" ;;
		"Charging") status="+" ;;
		"Discharging") status="-" ;;
		"Not charging") status="/" ;;
		"Unknown") status="?" ;;
		*) exit 1 ;;
	esac
    capacity="$(cat "$battery/capacity" 2>&1)"

    warn=""
    [ "$capacity" -le 25 ] && warn="!"

    printf "%s[%s]%s" "$warn" "$capacity" "$status"
done