I did own the 5s, now it’s the FWs’ phone. With my job I would say I use my phone an average amount but don’t have a chance to charge during the day. A few days it wouldn’t have made it through without me turning it off.(about 9 hours) I know many people with the 4s and the battery life was much better. My wife bought the case for the 5s with the 80% battery extension on it and loves it, but the case dosnt offer as much protection as like an otter box or a life proof case, and I’m kinda hard on my phones in my line of work.