I have an iPhone 5s and updated the day iOS 9.3.3 came out. I didn't notice any battery issues till Wednesday. It didn't even cross my mind till today about the update causing the issues. What I am experiencing is battery drain in my pocket when it is doing nothing and on cellular data. I went to my carrier and they went through the settings on my 5s and shut off anything that could be causing it to drain. They shut stuff off and that still didn't even solve the problem. They had me upgrade to a 6s and told me my 5s must have an antenna issue or something. My 5s is 2 years old and one month and according to a battery app I got off of the App Store, I have 772 charge cycles on it. I am wondering if I made a mistake upgrading and it could be an issue with iOS 9.3.3. You all probably think I am crazy since I am up for a renewel and I am not really excited about the 6s. I would rather keep my 5s if it is iOS 9.3.3 because I could save over $20 bucks a month for 30 months if I can keep my 5s. And also before you ask, I can afford a new phone but I just tend to save money and use things til they die. Can you guys think of things that could be draining the battery or is the battery pretty much worn out after 772 charge cycles over 2 years and one month of usage. Do u think if I downgraded to 9.3.2 it would go back to normal and how do you do that or is the phone battery just wore out? Thanks. Also how long do iPhone batteries usually last because the battery is usually what goes first.