Someone I know who wrecked their vehicle, gave me their salvaged, crappy-tire heated seat cushion... So I was thinking of removing the heating coils and installing them in one of my old, unused light weight (spring/fall) jackets. I know I have some math to do because the truck battery obviously has more jam than my bike's battery but this could be fun and inexpensive way to keep warm. Any comments or concerns? Happy apexes.