My iPhone 4S is displaying wrong Battery %?

My iPhone 4S is displaying the wrong battery percentage. How would I fix this? My phone started to die at 15% and now it's up to 30% where it shuts off. My phone is currently running iOS 6. Anyone know how to correct my battery issue?

Call 1-800-692-7753 (apple support line) and update to iOS 6.0.1, just go to Settings>general>software update>

Uh, Umm, Ya, hook it up to your cigarette lighter adapter in the car and run it off the car battery.

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