I plugged in my iPhone 4 using wall charger and sync cable and as soon as I plug it in I get a "plug" in the battery meter as if it is "fully charged", but it isn't. I started at 46% when I plugged in and it has taken the better part of the day to get to 89% right now. Usually never takes this long to charge from wall charger. Also, while it is plugged in and the screen is on there is a faint high pitched "chirping" coming from the phone. As soon as I hit Lock/Sleep it goes away, but when I hit the Home button and the screen comes back on the noise starts. Any idea what's going on?