Jon,
Yes I already have a bottle heater with a pressure switch and it is 12vdc. I have a line-in plug so it is a simple matter to connect to an external source which I already do in the pits. However with the reality of the 2-3 hr staging line slowly moving and no pit crew it is difficult to have a generator or large external battery with the bike. Without electric start on the bike I can barely manage my bike, me, and my helmet! But I am considering some type of car size battery or generator (with DC invertor) on a rolling cart so that I can move the bike then the cart while in line. Maybe I should put a trailer hitch on the bike. Thanks for the info on the battery heaters too. I will check them out.