I am having major battery life issues with ios 6.1 I have iPhone 5 16gb. Running ios 6.1 (jailbroken) Is there a reason the battery life stinks? Can I upgrade to 6.11 or 6.12? Or is the newest ios (6.13) my only option? I prefer to remain jailbroken, but this battery life is horrible. Any help for a newbie would be appreciated.