Total talk time on this thing is only 3.5 hours. So that works out to 14 blocks of 15 minutes, or 1/14th of your battery per 15 minutes.
So you dropping 1/10th is probably in the ballpark, since the battery gauge itself isn't that accurate.
Standby time is about 1-3% per hour, worst case 3-5% with BT on, with all the battery saving mojo you can find on teh intertubes applied. Hit the Touch Pro Essentials topic
http://forum.ppcgeeks.com/showthread.php?t=42730
For the usual battery tweaks.
I'm finding mine's usable, but I feel a lot less comfortable with its life then the mogul. I've got a spare battery, I just need a way to charge it
