Hi My daughter has a jail broken Iphone 4 running 5.01 Every time the battery level drops to 30% the phone shuts down and will not restart until it is plugged into a power source. I have tried hard reset and removing the latest apps without any success. Can any one suggest other options. What would be the symptoms of a faulty or failing battery? PS I also have a jail broken Iphone 4 which was bought at the same time and is running the same IOS but this does not have the same issue.