For the hard to remove when cold crowd, what about hot packs stored in a cooler? Get to the car and pull them out and lay them on the boots until somewhat flexible. Coolers work both ways; if the cooler is warm when the hot packs are put in and even more insulated with a blanket in the car, the hot packs should stay warm for hours.
Better yet, hot packs in a hot logic.
Sorry, I know you are a Dewalt guy. You may have to wait another season or two. Maybe you can borrow a battery from Phil.