My iPhone shuts down when the battery still has about 30%

When I then try to restart, it won't, but just show the red low battery icon with the charger cable telling me to recharge first. When I then plug in the charger, it shows maybe still 27% and starts to charge. Before this problem occured my iPhone went down to 1% or so and only THEN shut down automatically.
Have reset my iPhone and "recalibrated" the battery (total discharge followed by a full charge to 100% with original iPhone charger). Problem persists.
Thanks for any help!

Sorry, iPhone 4S, but IOS 7 something.

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http://support.apple.com/kb/TS2802
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AC Power:
System Sleep Timer (Minutes): 10
Disk Sleep Timer (Minutes): 10
Display Sleep Timer (Minutes): 10
Automatic Restart On Power Loss: No
Wake On AC Change: No
Wake On Clamshell Open: Yes
Wake On LAN: Yes
Display Sleep Uses Dim: Yes
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Disk Sleep Timer (Minutes): 180
Display Sleep Timer (Minutes): 2
Wake On AC Change: No
Wake On Clamshell Open: Yes
Display Sleep Uses Dim: Yes
Reduce Brightness: Yes
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Full Charge Capacity (mAh): 3004
Remaining Capacity (mAh): 2994
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Message was edited by: Rene Scrubei

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My iPhone shuts down when the battery still has about 30%

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