Low battery warning when battery full

This only happened to me this one time, but I have my iphone plugged in and the battery icon says it is fully charged, but I received a "low battery" warning.
Any thoughts as to why this may have happened?
Thanks!

What version of firmware are you on? There were battery gauge problems in 3.1.2 that 3.1.3 is supposed to fix. Meanwhile, you can try running the battery down until the phone shuts off, then plug in to the wall charger for 4 hours. Do this twice. if it still doesn't work right you may have a bad battery; take it to Apple.

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