If you’ve got an iPhone 4S and noticed a very short battery life, you’re not alone. It has been widely discussed on online forums and popular tech blogs.
Many people reported that it has something to do with the backup file you’re restoring into your new iPhone 4S. There’s a corruption somewhere but no one knows for sure. An extreme example is that a user was seeing 10% battery life dropped per hour even in standby mode.
Here’s a possible fix that you can try [Warning: This procedure may cause loss of data so be very careful or proceed only at own risks].
Step 1: Transfer your purchased content
Transfer all content purchased or downloaded from iTunes, the App Store, and the iBookstore from the device to your computer before you restore. If you have movie rentals on the device, see iTunes Store movie rental usage rights in the United States before restoring. Purchased content is transfered while syncing, but you can also choose to transfer purchases by following the steps below or going to iTunes Store: Transfering purchases from your iPhone, iPad, or iPod to a computer.
- Launch iTunes
- Connect iPhone
- Right-click the device from the source list
- Choose Transfer Purchases
Step 2: Back up your device and preserve the backup
The restore process creates a backup of the device you are restoring. When you select Set Up As New, a sync occurs that writes over your previous backup. To prevent unwanted data loss, you should take steps to preserve the backup created by iTunes.
- In iTunes, check Preferences > Devices to check the date and time of your latest backup
- If you do not have a recent backup, create one by right-clicking the device in the source list and choosing Back Up
Step 3: Restore your device
Restoring your device will delete all the data from your device, including songs, videos, contacts, photos, calendar information, and any other data. All device settings are restored to their factory condition. iTunes may need to connect to the Internet to verify or download a restore image for your device.
Step 4: Set up your device as new
To set up as a new device in its factory configuration, choose “Set up as new” Be sure you have backed up the appropriate directory or backup files before choosing to set up as new.
Step 5: Finishing touches
Right-click the device in the source list and choose Restore from Backup and choose the desired backup from the list provided.
Note: Restoring device creates another backup, be sure to choose the correct backup from the list [the one before factory restore], it will prompt telling you there is a newer restore point. Ignore and click USE OLDER RESTORE POINT.
Last but not least… A Simple Workaround…
If you’re not using iCloud, removing it from your iPhone 4S seems to work:
Simply go to Settings > iCloud > “Delete Account”
I hope the above would work for you. Since the battery used is standard in all iPhone 4S, I’m pretty sure this issue is caused by software corruption as there are also many iPhone 4S users who did not encounter this issue at all.
Share with other fellow readers if it works for you or not.
Adapted from this tutorial on Apple’s website.