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Well, the phone was so far gone, the genious bar dude at the Apple store hooked me up with a new one. He said not all portable chargers are completely compatible with 3G or 3G-S. There's an adaptor to match up the pins correctly. Now to restore n jailbreak again...
Thanks for all your suggestions. Unfortunately, nothing's working. Left plugged into PC, and wall charger for a few hours each and no luck. Is it possible the battery took a dump?
So, I have a jailbroken 16Gig 3G-S with 3.1.2 firmware. I was checking a vmail, and noticed the phone had less than 10% battery left. Then I plugged it into one of those duracell portable AA battery supplies and it said this device is not compatible and asked if I wanted to enter airplane...