Battery Weirdness

Hey Everyone, wondering if anyone else has seen something like this or if I have an issue...

Woke up this morning to about 10% battery life on my iPhone 3G, which was odd as I had almost full power when I went to bed the night before. Regardless, I got in the car, plugged my iPhone into my griffin car charger and drove to work listening to a podcast.

About 20 minutes later, the iPhone went into "emergency battery" mode (died and just showed me the batter icon and the charging icon) and would not come back to life...

Is my phone not charging on my car charger even though the icon says it is???

Thanks,

Aeryk