iphone 5s battery last only 6hs
Hello,
So I just bought a used iphone 5s, the problem is that the battery only last 6 hours (standby) or 1 hour (usage). It doesn't mater how much I use it, it always last the same. I can leave it unused overnight or play games constantly, it only last 6 hours. I tried all the possible settings and nothing seems to work. So I changed the battery, and It had no result, it keep lasting 6 hours. Am I going crazy here or whats going on? I even restore it and set it up as new phone with no result. I have the latest IOS 9.0.2.
Helpppp
Thanks
iPhone 5s, iOS 9.0.2