Ok, so after 8 hours of me at work, here is my phone battery status. This is without any kernel. this is with a couple of calls, exchange, and gmail and some text. I also played a couple of small video clips.
The change in battery is because I installed drop box to upload the pictures with. Guess it gives you idea of what 15min of use can do.
In that time I also did a speed test via flash.
Hope this helps.