Many users who have upgraded their iPhone to iOS 6.1.3 have encountered a poor battery life, and as you will see later, it may be caused by iCloud.
Many users have left a complain on Apple community about battery performance, but one in particular says he has found the solution to the problem. It seems that the user Timurjonchik has solved the annoying bugs by disabling some of the settings to iCloud and many of the users in the conversation confirm its woking.
Here are the steps you need to perform if you want to solve the problem:
- Go to Settings, under Mail, Contacts, Calendars .
- iCloud Tab and toggle off all the options, making sure to keep the data on your iPhone, and not delete them.
- Repeat this for each e-mail account, but always make sure you select Keep on My iPhone.
- Do a hard reset of the device by holding down the Home button and the Power button for 10 seconds (until the iPhone turns off).
- Wait until the device reboots, go back to Settings, and then under Mail, Contacts, Calendars reactivated each switch that you had disabled earlier.
Now, after several minutes of test, you should notice a significant improvement in battery life. This is not an official fix, but this worked for many users so its better to give it a try.
If you have performed the procedure, let us know if the problem has been solved or not. Be careful on step 2 and 3, as you may accidentally deleted the data, rather than select the item to keep you on your iPhone.