Last week there was an article which gave you a hands on look at the battery life of the iPhone 5 and 4S following the update to iOS 7. In the test with iOS 7 the battery life of the iPhone 4S did lead to some questions, after installing the latest OS, the device did suffer badly from battery drain.
You can see from the previous article that the iPhone 5 performed perfectly when it came to battery life, while the battery of the iPhone 4S drained down very fast. The article did get a lot of feedback from users of the iPhone 5 and the 4S who had issues with battery drain on iOS 6, after looking at iOS 7 issues it was then evident of how to remedy the battery life.
After spending hours on the beta version of iOS 7 on the iPhone 5 and iPhone 4S, the tests showed a large difference when it came to battery performance. We saw this when we installed iOS 6 last year and feedback showed us an issue for many users of the iPhone.
It seems that it is obvious that in the majority of cases this is not an issue with hardware and it happens when installing an update such as iOS 6 or in this case iOS beta 1.
Tests showed that the battery drain on the iPhone 5 and iPhone 4S installed iOS 7 without any battery drain issues at all but we think that this could have been down to pure look. Tests revealed that the problem could happen randomly and it was dependent on the conditions of the installation. However on saying this there is an easy way to install iOS on your handset without the battery drain issue.
We fixed the battery drain issue on two development iPhones simply, however you should not have to do this if Apple release a fix at some point in time.
First we made a backup of the handsets and then made a clean install of iOS by going into DFU mode in iTunes. You can do this by keeping the Sleep/Wake button held down, along with Home button. When the logo of Apple appears you keep hold of the Home button until iTunes sends you a message that the device is in recovery mode.
After installing the fresh copy of iOS 6, we then installed iOS 7 beta and then restored the data from the back up. You can downgrade from iOS 7 to iOS 6 but only if you have made a backup in iTunes of iOS 6.
The bottom line was that the iPhone 4S battery life drain was major and it did drain the device in just hours. However you can fix this by doing a clean install and then restoring your back up. It seems that the battery drain happens when people restore back-ups without having made a clean install first.
Have you had any issues with battery life with your iPhone 5 or 4S? Did you make a clean install and then updated your iOS? Make sure that you make a backup and then wipe date.