I found the command that the Kindle runs to check battery power as a percentage
"gasgauge-info -s"
try running this! its so cool!
I'm going to start writing a script to do the first option I was talking about, just as a proof of concept. I think I'll have it update every two minutes
UPDATE:
here's a proof of concept
============
#!/bin/sh
while [ 1 -eq 1 ]; do
retstring="System Information:\n\n"
retstring="$retstring \tBattery: `gasgauge-info -s`"
echo -e $retstring > /mnt/us/documents/SYSINFO
sleep 120
done
============
$ chmod a+x sysinfo.sh
$ ./sysinfo.sh &