The solder seal type heat shrink tubing has a lead bismuth alloy which melts somewhere in the 300°F range. Mostly for use with a heat gun but a butane lighter will do. Crimp then solder shrink and seal in one motion. The nylon version of black spiral wrap is incredibly durable. I've wrapped arc welding cable and MIG stinger leads with it and the cords remain undamaged laying on a shop floor. I like stuff that lasts. The capacity test of the 31XT Lifeline is underway. It was first charged for 6 hours at 14.40 volts @ 15c