Cycle the Battery!!
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I have had my iPhone since day one. Of course, I took it home and immediately activated it. I did leave it connected to the computer (and umounted) for several hours before using it. After that, I didn't pay any more attention to the battery. I charged it every night.
I then began reading articles about people complaining about the battery, especially the battery meter. They complained that some iPhones are not charging fully. They said that when the iPhone is fully charged, the battery meter (the meter you see when iPhone is connected to the USB Dock charger) should be green all the way across and should also be "glowing."
That is when I noticed that my battery was NOT fully charging. The large battery meter was green ALMOST all the way across, but not quite. There was just a little sliver of the meter that was not green. Also the meter was not "glowing" when fully charged.
The articles I read seemed to suggest that the problem was software releated and not the actual battery, so I really didn't give the problem much thought. But then, I talked to a Mac Genius buddy who insisted that I cycle the battery.
I followed his instructions which I will detail below:
1.) I ran the battery all the way down until iPhone shut itself off (this is a safety feature and will not harm the battery).
2.) I charged the battery fully (about 8 hours, although 4 would have been sufficient). I also powered the iPhone off after connecting it to the dock charger.
3.) The next morning, I took the iPhone off the charger and left it turned off. I let it sit for about 8 hours turned off in order to set the resistance level of the battery.
4.) I ran the battery all the way down again last night.
5.) I gave it a second complete charge while I slept last night. This morning, I have a fully charged battery AND the battery meter is green all the way across and is glowing!!!
24" iMac 2.33 GHz Intel Core 2 Duo & 500 MHz Titanium PowerBook G4 15", Mac OS X (10.4.10), iMac: 2GB DDR2 RAM, Matshita Superdrive. PowerBook: 512 MB RAM, Matshita DVD-RAM