I have all these 12v Bosch tools and wondering if someone has come up a way to use the batteries for heat gear. I know you can by them specifically to plug into your jacket but they cost too much. Besides, that would be too easy. I could charge up a handful of 12v Bosch batteries and be set for a weekend of chilly outdoor activities. Just need a way to connect battery to jacket. Im tempted to sacrifice on of the tools if needed maybe a flashlight. Then its just a matter of the cable to jacket. What do you all think?