Battery usage problem in Android 2.3.6 Since the update to Gingerbread the battery of my phone has the half duration than with the 2.3.4 version.

The "Battery Usage" in settings don't show anything abnormal.

Anybody have the same problem? What can I do?

Edit:
My device is an HTC - Nexus One
Check native email app. Sometimes it starts running and never stops, eating the battery to the end. I don't know how to solve it, so I keep checking and killing it when it starts to behave like this.