"charging not supported by this accessory".  If I leave it plugged in, it charges, but I noticed that the charge doesn't seem to hold as long.  What does this mean?

Why every time I plug my phone in using a USB cord or charger does it say "charging not supported with this accessory"?  The phone will charge if I leave it plugged in long enough, but I noticed that it doesn't hold the charge like it used to.  Is this the battery, or something else?

Hi CJ-
There are some chargers designed for thr original iPhone that are not compatible with the 3G and later models. Are you using the USB cable that came with the 3G?  That cable, when plugged into a computer USB port, or, when plugged into the power cube / wall outlet, should charge the 3G just fine. 
Due to the nature of Lithium Ion batteries, there are safeguards in place to prevent the wrong type of charger from supllying charge voltage to the batteries, and if the proper pins and resistance is not detected by the phone,  the circuitry will block charging and give that message.
Therefore:  If you are using a 3G compatible (oem, or otherwise valid charger), and you're seeing that "not supported" message, it could be the cable you're using, or it's the phone/circuitry detection in the phone that detects the cable / charger type.
And, if you are getting some charge, but it's not holding very long, it could be that it's a 3G, and the lifespan of the battery is near end of life.   The fact that you're getting a charging not supported message is probably of more importance as to why the battery is not fully being charged.

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