#!/bin/bash

for b in /sys/class/power_supply/BAT*; do
    [ -d "$b" ] && BATTERY="$b" && break
done

if [ -z "$BATTERY" ]; then
	echo "Kein akku gefunden"
	return 1
fi

if [ -f "$BATTERY/capacity" ]; then
	CAPACITY=$(cat "$BATTERY/capacity")
else
	echo "Akku kann nicht gelesen werden"
	return 1
fi

if [ "$CAPACITY" -gt 0 ]; then
	echo "Akku bei $CAPACITY % "
	return 0
else
	echo "Akkustand 0%, prüfen"
	return 1
fi