I have been reading Beginner's Guide to DSLR Astrophotography by Jerry Lodriguss, and I recently read a section in which he displayed a photo of his imaging setup. In the setup, his 12v deep-cycle battery is housed within a cooler to protect the batter from the cold. Is this a common practice?
I ask because that is the first time that I have seen such a setup. If this is a standard practice, would it be beneficial to throw a heat pack or another safe source of radiant heat into the cooler with the battery in order to maintain a warmer temperature as the cold air enters the cooler through cutouts that cords pass through?