My iPhone 4S shuts down randomly?

I just got an iPhone 4S and I will charge it full but somehow I loose battery so fast and then when it's about 50% it just shuts down randomly I checked for updates it's said I have the latest update does this mean I have to restore my iPhone?

Well you should probably contact Apple. That's what my friend did and they were able to fix the problem

  • Why does my iPhone 5 shuts down at 7%? I had the same problem with my iPhone 4 and it kept doing that and every while it shuts down at 7% than 10% than 15% than 20%! And I had to sold it! I really don't want the samething to happen to my iPhone 5! Because my parents won't buy me another phone? I don't have warranty and I can't change the battery because it's expensive!
  • My laptop shuts down in the middle of iPhone music syncing? I've synced my music onto my iPhone 4 from my laptop before, but recently, when I try to sync my updated music onto my phone, it resyncs All of the music I already have in there and then my laptop completely shuts down sometime after syncing 100 songs… It has happened multiple times and is very irritating.
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  • My iPhone 4S shuts down 3-4 times a day. What will Apple do? I had my iPhone 4S since December 30, 2012 and it started to shut off at random times. It gets pretty annoying when I'm rebooting it. When I take it to the Apple Store, will they replace it? If so, how much will they charge me?