Iphone 5s charge running out vey fast after 2 says of buy, brightness is 20% and?

I went to app forums and folowed several links to save charge but still not much improments

Added (1). http://www.everythingicafe.com/forum/threads/iphone-5s-questions-and-issues.104931/page-4

I heard that there's a problem with some iphone 5s so that you have to replace. I got one, but mine is okay

So little details who knows

  • Why running down my iPhone 5 battery so fast? We bought 3 weeks ago and we use it since few days and i seen that it ran down so fast. I thought that because of the internet and LTE because it always using for example weather ect. I blocked all connections and now using just 3G and now better but still run down fast:/ the phone's battery is the wrong or its normal?
  • Why is my iPhone 4s running out of battery so fast? Obviously iPhones are renowned for low battery lives. But mine is normally fine, i turn my apps off, brightness is never usually high. Though starting yesterday it has been dropping ridiculously quickly, going from 100% at 9am and then within the hour it's gone to less then 30%, my battery isn't lasting longer then two hours before dying, previously it had lasted as long as 8 hours and is heating up alot, can anyone help me out?
  • Why is my iPhone 4s running out of battery so fast? - 1 It started yesterday i would wake up with 100% battery and within an hour it's already on 20% and i haven't even used it?
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