Also a very essential setting (especially if processor is enabled for 125 or 250 mhz!) is the Sampling Rate, which is 300.000 ms by default. I've been using 75.000 ms now for months, and it works great without any effects on battery draining. Up threshold 90 has worked nicely also, and Mhz setting has been 950/500. On vacation I noticed that the battery lasts about a WEEK (!), because I didn't do much surfing, calling or anything else than idle.