This is a spin-off of the endless overclocking thread http://talk.maemo.org/showthread.php?t=39753
The focus of this thread is not overclocking for improved performance but
how we save battery power with tricks like underclocking to 125MHz or reducing
the voltage for the different CPU frequencies.
A related thread is http://talk.maemo.org/showthread.php?t=43748

my latest low voltages kernels
http://wiki.maemo.org/Overclocking#I...mental_kernels

egoshin's advice http://talk.maemo.org/showpost.php?p...&postcount=189

smartreflex http://talk.maemo.org/showthread.php?t=48207
http://talk.maemo.org/showthread.php?t=49228
battery life http://talk.maemo.org/showthread.php?t=31020

powertop for N900 http://talk.maemo.org/showpost.php?p...3&postcount=21

Install battery-eye or batterygraph to monitor your battery consumption.
Please share your experiences with battery life here.