Iphone 4S shutting of at 85% ever 2 minutes?

My phone just started to turn of by itsself around every 2 min. I looked online and found that it happened to others at 85% battery life, but this has never happened to me and i've had this phone for a long time what is wrong?

Battery is dead. This happened to my old laptop. It's battery started lasting around 5 minutes. I bought a new battery and it started lasting 6.5 hours. Just take it into an Apple store and ask to get the battery replaced

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