Let's make sure you're able to get a full charge, beck61. Are you able to test a different charger, or use the USB cable to connect the phone to a computer?
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The battery could be toast. It happens... especially on older model devices. If you have tried another Lightning cable and your sure that is not the issue take it into an Apple store (assuming you live near one) after setting an appt online. They offer affordable options to have the battery changed in-store. Let us know how it goes.