*Disclaimer* this may or may not work for your phone but I have personally gotten things sorted out so I am happy with my battery consumption now. (seems to be back to normal)
If you are still on lower versions of the iOS and are happy with your phone, upgrade at your own risk. Results may vary.
NOTE: I wish I was still on 6.1.3 Jailbroken than anywhere in iOS 7.
I will detail the things I have done with my phone and you can follow what I have done. (This is not a Jailbroken Phone as there is no Jailbreak available for 7.0.4) If you have a jailbreak at an earlier version and wish to maintain your Jailbreak, DO NOT UPGRADE!
1. Upgraded my phone from 7.0.2 to 7.0.4 using over the air upgrade through 3g. (It is HIGHLY recommended to upgrade your phone through iTunes by cable instead of using over the air. I just did it this way. Upgrading by cable through iTunes is much more stable than Over the Air.)
2. After upgrading, I experienced very very bad battery life. 4 hours or less and the battery would go from 100% to less than 20%.
3. SETTINGS:
a. Go to Settings - General - Reset - Reset All Settings: This will not delete any of your data on your phone. Pictures, contacts, notes, etc will all be intact. This will basically reset all wifi and other settings back to default settings.
b. Turn off the following unless needed.
- Wifi, bluetooth, Personal Hotspot,
- Under Cellular, I always leave LTE off. LTE is not yet widespread in Manila and the act of searching for LTE all the time is a very significant battery drain.
c. Turned off
- Under PRIVACY - Location Services: on the bottom you will find System Services. I basically only left ON Compass Calibration and Wifi Networking. Everything else is OFF. (I will experiment with these items one by one in the near future to see how much it affects battery life but as for now I have turned many of them off)
- I have also turned off Frequent Locations.
- Under Settings - General
- Siri - Turn this off unless you like voice dictation and use Siri services. (I only turn it on as needed as I find voice dictation useful at times.)
- Background App Refresh - I turned off most of the apps that I do not use frequently. Personal Preference although it doesn’t seem to affect much battery life.
- Date and Time - Set Automatically - Turned off
- Settings - iTunes & App Store - Most items in this setting I have turned off. This is useful if you Purchase music, Apps, Books, on iTunes and App Store on multiple devices. Apps, Music, Videos, and Books will download automatically to all your devices that are registered under the same Apple ID.
d. Brightness set to about 25% - This is personal preference. Set brightness to the lowest setting that is still viewable and comfortable for you.
After having done all of these settings, my phone is now back to normal battery consumption which is good for 8-12 hours standby. (depends on if you are a heavy user)
Other resolved issues:
- Mass text no longer crashes under 7.0.4 and I can now text 50+ people again.
Overall this iOS update seems to be more stable with less glitches.
Good luck with your phones and hope this helps.