Did a Reset to Get iPhone 4S Battery Life Back to Normal

File this under #firstworldproblems, but somehow in one of the latest iOS updates or new app installs, my battery life on the iPhone 4S started dropping insanely fast, easily 5-10% per hour even when unused.

I’ve been using a Mophie battery case since SXSW, so I almost didn’t notice the real problem, but decided yesterday to go hunting for a solution.

I found a thread on the Apple support forums, and was skeptical, but gave it a try:

1. Reset all settings (GO TO: settings -then> general-> reset all settings)

2 a. Go through initial setup steps (lang, wifi, siri, enable location, etc) and choose setup as new phone (don’t worry your apps, data, contacts, mail will still be there). Do NOT restore from iCloud or iTunes (It can copy back corrupt settings)

2 b. If you do not get the complete new setup screen with language setup and setup as new phone or restore from iTune/iCloud backup, be sure to go back to #1 and reset all settings again (it should happen the second time)

3. Turn off system location services timezone and iAd (settings -> location services -> system services)

4. Fully discharge battery (until you get the spinning wheel and it shuts off)

5. Fully recharge battery (overnight if possible)

And 48 hours later I’m happy to report that my battery life has never been better. It’s nearly midnight now, and I was on a few hours of calls today, and the battery is at 14%.

YMMV, but worth a try if you are seeing issues.