mathers420
Observer
If you are seriously considering running a block heater without a power source, you need to consider a real heater that runs off the fuel in your gas tank.
http://www.expeditionportal.com/forum/threads/54366-quot-cordless-quot-engine-block-heaters
http://www.expeditionportal.com/forum/threads/54366-quot-cordless-quot-engine-block-heaters