A few observations from me:
- after initial install, at not so fresh but well maintained N900 i had a massive battery drain. Or better if I wrote MASSIVE - six hours from 100% load to powered off phone without any activity and in offline mode (overnight). Uninstalled kp50.
- I`ve wanted to give it another try so flashed my device and installed it again on pure&clean CSSU testing (updated from PR1.3.1). From there I`ve started to install my applications one by one, watching how system performs battery wise. Right now I installed all of them (the same like when that huge battery drain appeared) except one - hildon desktop lockable in portrait (http://talk.maemo.org/showthread.php...sktop+supports).
- SUCCESS! Running with "dsp" (VDD1&2=1) profile as default, with whole bunch of my apps installed, third day at one charge. Yes, THIRD DAY. About 20% juice left.
I`m guessing that there are some compatibility issues between kp50 and that specific h-d version. So if any of You were struck by battery drain after kp50 install AND are using that h-d, try to remove it and return to CSSU h-d version. It will prove my guess right or wrong.
I`m completely, totally and absolutely blown away with this battery efficiency: it`s almost three times more than before (1 day to charge vs 2,5~3 days to charge). Massive improvements are especially shown when device is on standby (idle) - battery graph is close to flat. Writing "thank You pali" is not enough for this, but nevertheless: thank You pali!

PS - closing thought: please include proper version of h-d with portrait lock in next CSSU.