My iPhone shuts down when the battery is still 18%, what's wrong?

Sooo my phone started to shut down sooner and sooner (5% - 9% and now 18%).
I usually charge it every night and in the morning it says 100%.
Also, the battery percentage drops a lot in a short amount of time.
I don't use my phone excessively or anything so I don't understand why it would just shut down like this.
- iPhone 4s 16GB with iOS 6.1.3
Please help.

Hi irebecca16,
Thanks for visiting Apple Support Communities.
You may find this article useful for troubleshooting your battery issue:
iPhone: Hardware troubleshooting
http://support.apple.com/kb/TS2802
Best,
Jeremy

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Have reset my iPhone and "recalibrated" the battery (total discharge followed by a full charge to 100% with original iPhone charger). Problem persists.
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Thanks, you're a life saver. Here is the report:
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
Battery Power:
System Sleep Timer (Minutes): 10
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
Battery Information:
Battery Installed: Yes
First low level warning: No
Full Charge Capacity (mAh): 3004
Remaining Capacity (mAh): 2994
Amperage (mA): 0
Voltage (mV): 12385
Cycle Count: 41
AC Charger Information:
Connected: Yes
Charging: No
Hardware Configuration:
UPS Installed: No

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Thanks, you're a life saver. Here is the report:
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
Battery Power:
System Sleep Timer (Minutes): 10
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
Battery Information:
Battery Installed: Yes
First low level warning: No
Full Charge Capacity (mAh): 3004
Remaining Capacity (mAh): 2994
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Hi irebecca16,
Thanks for visiting Apple Support Communities.
You may find this article useful for troubleshooting your battery issue:
iPhone: Hardware troubleshooting
http://support.apple.com/kb/TS2802
Best,
Jeremy

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when the battery goes to about 50%, my iPhone shuts down when I make a call (or receive) one. When I turn it on again (without charger) and try to make another call, it shuts down again There is no low battery warning!
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Message was edited by: Rene Scrubei

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1. Reboot the iPhone on your own. Hold down the button on the top and wait until you get the red bar telling you to slide to turn it off. Power down, reboot and see if the problem persists.
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Model Information:
Manufacturer:          Sony
Device Name:          ASMB012
Pack Lot Code:          1
PCB Lot Code:          0
Firmware Version:          110
Hardware Revision:          500
Cell Revision:          303
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Charge Remaining (mAh):          4108
Fully Charged:          Yes
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Full Charge Capacity (mAh):          4200
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Cycle Count:          40
Condition:          Service Battery
Battery Installed:          Yes
Amperage (mA):          0
Voltage (mV):          12361

My iPhone shuts down when the battery is still 18%, what's wrong?

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