#!/bin/sh

ENERGY_FULL=`cat /sys/bus/acpi/drivers/battery/PNP0C0A\:00/power_supply/BAT1/energy_full`
ENERGY_NOW=`cat /sys/bus/acpi/drivers/battery/PNP0C0A\:00/power_supply/BAT1/energy_now`
POWER_NOW=`cat /sys/bus/acpi/drivers/battery/PNP0C0A\:00/power_supply/BAT1/power_now`

echo "Battery left: $((ENERGY_NOW * 100 / ENERGY_FULL))%"
echo "Current usage: `echo $POWER_NOW | awk '{ printf("%.2f", $1/1000000) }'` watt"
echo "Time left: `echo $ENERGY_NOW $POWER_NOW | awk '{ printf("%.2f", $1/$2) }'` hours"