My iPhone 4S shuts down when it says it's still got charge... Is it worth replacing the battery

I charged my phone to 100% and the charge went down really quickly. It then turned off at 25% and a few minutes later turned back on if I hold down the two buttons then turned of again at about 15%. I keep turning it back on to get it really low so I could recalibrate the battery and the charge still went down really quickly and this time it turned off at about 9% but then charged it not to full and it turned off at 20%
Is it worth replacing the battery or is there something else making this happen?

If the phone is no longer under warranty, you can get a new battery at a third party like ifixit.com and any tools you might need to replace it.

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IPhone often shuts down when it's comes about a 15 - 20 percent,
And when trying to turn it on appears on the screen there is a need to plug in (to charge).
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That might occur if you're using the iPhone in low temperatures as the battery decharges quickly in lower temps. If you're using the phone at a normal room temperature I have no idea why your phone shuts off at as high as 20%. Also, if you use your phone in too high temperature areas the battery lifespan will decrease. The more you
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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
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Display Sleep Timer (Minutes): 2
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Wake On Clamshell Open: Yes
Display Sleep Uses Dim: Yes
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First low level warning: No
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Remaining Capacity (mAh): 2994
Amperage (mA): 0
Voltage (mV): 12385
Cycle Count: 41
AC Charger Information:
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Charging: No
Hardware Configuration:
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I only posted this because it was a very frustrating problem that no one really seemed to figure out a solution for.
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My iPhone 4S shuts down when it says it's still got charge... Is it worth replacing the battery

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