What should i do when my iphone 4S shuts down at 20-30% battery?

I have gotten a few times the situation that my Iphone shuts down and it was still at 20%+. When i try to turn it on again it says that the battery is out. I put it back in the charger and i can turn it on immediately. What should i do? It is still in guarantee period
Greetings

Try recalibrating the battery meter... fully discharge (until it shuts off) and then fully recharge (don't unplug until 100%) to recalibrate the battery meter. You may need to do this a few times.

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You might see this unexpected behavior on your iPhone, iPad, or iPod touch if you have an older version of iOS. These steps can help.
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https://discussions.apple.com/message/24599275#24599275
https://discussions.apple.com/message/21043837#21043837
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What should i do when my iphone 4S shuts down at 20-30% battery?

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