6.0.2 does not address battery issues.
Battery life issues depend on many different factors.
Lets check some of the more common causes of poor battery life.
Go to Settings>General>Usage
Scroll to Standby and Usage.
Standby is the amount of time your device has been off the charger since your device was last at 100%.
Usage is the amount of time your iPhone has been in use since it was last at 100%.
If your usage looks like you are going to at least 1 hour of usage every 15-16 percentage points your battery is fine.
Now if your usage and standby are identical your OS is corrupted and you need to restore your device as new.
As new means no back up as a back will place said corruption back onto the device.
Now if your device is not showing matching or similar standby and usage and you are not getting close to 6 hours under usage go to your brightness setting. If your brightness is set higher then 50% your killing your battery every time you look at your device. So two tips turn it down or set your auto lock to 1 minute.
Anyways if that doesn't work go to apple they can run a physical test on the battery. Also check apple.com/batteries for more tips.
