Just to show the battery is not a fluke....

I have two phones and the longer battery use one has the build of 26th installed, the more recent one has the build of 29th.

Both have had WiFi (5Ghz) always on, some short calls, GMail and Hotmail polling and are using about 1% or less of a normal 1650Mah battery per hour. Deep sleep is working great as far as I'm concerned.