To avoid the repeated Battery Fully Charged notification, plug your phone charger into the phone. Then go into Settings>General>Battery (under Phone Management), and select Battery Information. You should see a graph of Battery Usage Level. Turn the phone off using the button on the back. You should get one notification when the battery is fully charged and the notification LED will turn from red to green. Note: if you receive a call, text or voice message, you'll probably have to repeat the steps.