#
# If no battery found, bail out
if [ ! -d /sys/class/power_supply/BAT1 ]; then
   echo "***ERROR***; Battery not detected"
   exit
fi
#
# Get line containing full design charge value
full=`grep POWER_SUPPLY_CHARGE_FULL_DESIGN /sys/class/power_supply/BAT1/uevent`
#
# Strip out everything except the actual number itself
full1="${full#POWER*=}"
#
# Get half of the full value, for use in emulating "round offs" in integer
# arithmetic.
half=$(( ${full} / 2 ))
while true
do
#
# Get line containing current charge value and strip out everything
# except the actual number itself
   now=`grep POWER_SUPPLY_CHARGE_NOW /sys/class/power_supply/BAT1/uevent`
   now1="${now#POWER*=}"
#
# Multiply by 1000, so that the following division is actually 10 times
# the percentage.
   now2=$(( ${now1} * 1000 ))
   percent=$(( ${now2} / ${full1} ))
#
# Get the remainder of the division.  If it's greater than or equal to
# half the divisor (as determined above) add 1 to the percent x 10 value.
   remainder=$(( ${now2} % ${full1} ))
   if [ ${remainder} -ge ${half} ]; then
      percent=$(( ${percent} + 1 ))
   fi
#
# Treating ${percent} as a string, figure out where to place a decimal
# point to fake 10ths of a percent.
   pointer=$(( ${#percent} - 1 ))
   percent1="${percent:0:${pointer}}.${percent:${pointer}}"
#
# Backtrack the cursor up to 7 columns, and display the new value
   echo -n "${percent1} %"
#
# Wait 5 seconds and update again.  This is an infinite loop.
   sleep 5
done