Why my iPhone 4S goes flat on 19%?

Once it hits 19% it goes straight to 1% and switches off. Once I turn it back on it says it's still on 19% but continues to switch off

You need to change the battery replace it DO NOT REPAIR and restore the iphone, and do not back it up as it will come again if you back up and restore the back up, just restore it to the factory settings. Hope i helped!

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