I've got a 5 on Vrzn and was getting over 6-7 hours of usage time on 6.1.3. I got over 8 back in September. Now in the last week I noticed I was charging the phone more, and I can't seem to break 5 hours. Tried a restore as a new phone, it will make it past a day of two in standby, but when in use it burns through battery. I'm not going to take any of my households phones in to apple as I'm just going to get the same meaningless flub from the idiot bar and receive some refurb. Hopefully others like myself will chyme in on this about the issue and Aplle's horrible software engineers fix the issue. I've already sworn off Macs, now this may be the swan song for IOS devices as they always "start" having battery issues halfway though the product year and Apple always "starts" saying they are addressing it with software.
I don't take Apple seriously as they don't ever acknowledge or even accept blame for issues. 3 weeks until the Galaxy S 4 is out and my household and I are gone. Being vocal on non apple forums is good, and that only seems to veer potential customers away from Apple. Even though that is a good preventative measure for them, it does little to fix my issues.
Others have already stated the same, Apple needs to wake up on design. What good is all this tech if the device can't remain powered. It's a phone, not a sports car.