Battery drain while charging in car

[doggiedog]

My Epic 4G has a strange problem while trying to charge in the car. Whenever I plug it in, I actually lose power rapidly. Today, I had it plugged in for 15 mins and my power went from 47% to 8% and the phone was very hot.

I originally thought it might have to do with the old version of Bonsai (3.0) that I had but I upgraded to 4.1.1 and the problem still exists. Has anyone else had this problem? It is extremely limiting to not be able to charge my phone in the car. I don't have anything running on the phone while charging. This only happens while charging in the car.

Thanks,

DD