And Google Translate says,
'Why do I have to find a solution after I bought a product that balio € 700?
And who is this "install as a new iphone", as long as they lose then redo all imformacion someone pays?
Go apple response!'
Anyway, the reboot, recommended by tracyscottbrooks, actually worked.
For some reason, retrieving any backed up information through "Restore from Backup" or updating the software directly to iOS 6 causes some type of battery overuse.
I tried "Restore from Backup" after resetting my iPhone through iTunes, but it did not fix the battery drainage issue.
So, after "Setup as New [iDevice]," just restore your information from iCloud.
Also, by using "Setup as New [iDevice]," my custom labels in Contacts, when choosing to add a new contact, actually came back, along with "Add Custom Label."
Again, if choosing to restore the iDevice during the earlier stages of the process - choosing "Restore from Backup" instead of "Setup as New [iDevice]" - your battery and Contacts labels issues may not be resolved.
However, the phone is still vibrating when choosing an alarm sound. But the phone does NOT vibrate in Sounds > Sounds and Vibration Patterns > [choose any from that list] > [page up to Vibration, and select a vibration pattern]. None of the standard choices give a demo of their vibration patterns.
Regardless as to whether or not a direct iOS update is causing the battery drainage, the entire software needs to be more...polished.