I have the Rezound with extended battery (only about 1.5 weeks old). I purchased it in my home town of Phoenix AZ, then that same day flew to Vegas. I was there for over a week and loved the phone, minus a few quirks, but that is another post. The whole time there I was using the internet, taking pics, talking on the phone and never had a battery issue.
Now I am back in my home town, and the phone can't even go through a 10 hr day with MAYBE 40mins of talk time and the rest is pretty much idle or the occasional time check. No 4g usage, limited texts. The phone remains idle more than not for sure. I already tried *22899 to see if maybe that was causing it. Not sure what else to do.
Maybe it is time to root and freeze the bloatware (I am techy and computer savvy but have never rooted my phones before). But I can't imaging NOT having the extended battery, otherwise this phone might be dead by mid day.