My Iphone 4s shuts off once it drops below 20% battery as if its completely dead. Before the update it would stay on until at least 5% or less.

I have updated my phone to the most recent but now my phone will randomly shut off after it drops below about 20% battery life... tonight I was at 21% and it shut off as if it was completely dead. Yesterday it died completely at 13%. It doesn't turn back on until it is plugged in and sometimes it will pop back on immediately after being plugged in. Is there a way to fix this or does another small update to fix this have to come out?

I have the same issue. I think it may be related to cold weather. I am now inside writing this without plugging it in immediately after it repeatedly shut off outside with ~18% battery. This is really bad. It almost left me stranded as I was expecting to call for a ride.
iPhone 4S, iOS 6.0.1, Sprint

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    <E-mail Edited by Host>

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    The home screen appears: The iPhone should be working. Update to the latest version of iOS if necessary. Continue charging it until it is completely charged and you see this battery icon in the upper-right corner of the screen . Then unplug the phone from power. If it immediately turns off, seek service.
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    iphone 4 shut off and wont restart

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    Restart..  Reset..  Restore from Backup..  Restore as New...
    Try a Reset of the Phone... You will Not Lose Any Data...
    Press and Hold the Sleep/Wake Button and the Home Button at the Same Time...
    Wait for the Apple logo to Appear and then Disappear...
    Usually takes about 15 - 20 Seconds...
    Release the Buttons...
    Turn the Phone On...

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