I have a battery drain that I tracked down to the google exchange software and google email software (not gmail). If I use titanium backup and freeze those two apps, I can get about 15 hours out of a single charge with normal usage. If those apps are not frozen, I use better battery stats and can see that the com.android.google.email wakes my phone NONSTOP!!!! like 1500 times in a 2 hour period. With those two process active, I get 5 hours tops out of my battery and that's with little usage. It would drain even when I turned push email to off. I need a fix for the exchange email though because I need it for work. Hopefully this gets fixed in an update.