Iphone 4s battery die at 20%?

Is it normal for my iPhone 4s battery to die at 20% screen goes blank then turns off? Had it about a year now

If you were not as dim as your I phone battery you would see that you were asking your question on a Car Maintenance & Repairs forum so go away charge your battery and your brain and try and get it in right forum next time.

  • Why does my iPhone battery die so quickly? I had my iPhone for about a year and a half, and recently I've noticed that the battery is draining incredibly fast. I've always had it on 3g internet/Wi-Fi and the battery never died this fast so I don't know what the exact problem is. I charged it to 100% yesterday and I only used it for maybe about 10 minutes and left it untouched for the rest of the night. Today when I woke up the phone was dead. I haven't changed the settings or anything fyi.
  • Why does my iPhone battery die so fast? I have boost magic, which is supposed to help my battery last longer, and I kill all my apps when I'm done using them. I go from 100 at 8am and I'm at 60 by 9:30am. And I hardly use it too, just to look up information quickly and I just set my phone aside. I let it go down to 20% battery and let it charge over night. It just started doing this recently. I also keep my brightness to pretty much 0 with the auto brightness on. And it still dies fast. What can I do?
  • Why does my iPhone 5 battery die so fast? Yesterday I left my phone to charge over the night and today about 8:20am I skyped my dad! I was talking to him on Skype for about 1:10 hours and then i didn't use it at all! Now my phone at 12:10pm is 50%. Why is it dieng so fast! Pissed as f*ck
  • Why does my iPhone 4S die when my battery is full? I recently got a used iPhone 4S and the battery is terrible. My battery can be at 100% and ill take a picture and it'll die. I can't use my phone for more than 30 minutes at a time. I've even had to buy a portable charger and it will still die. It's dies randomly all of the time even if my battery is full. What should I do? What's the problem?

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