Yes! Yes! Yes!
It works for me!
Code:
echo 0 > /sys/class/rtc/rtc0/wakealarm
echo $WAKEUPTIMER > /sys/class/rtc/rtc0/wakealarm
echo "mem" > /sys/power/state
Check my Shellscript on GitHub.
My Kindle KT3 keeps on a single charge, with 57 eips updates a day,
30-35 days.