A process for making inner (160-166) and outer ducts for a simple but effective plastic heat exchanger by a simple blow molding or thermoforming technique. Seals are formed by providing initially closed inner ducts (160-166) which are stacked on one anothe...

A method and apparatus which extends the useful life of a lead-acid type battery by applying conductive cooling directly to the bottom surface of the battery to maintain the battery at a constant temperature of about 25 DEG C regardless of the ambient temp...