Your Backthing may be upgradeable to a Heated Backthing. This upgrade kit provides everything you need: 1 Heating element, 1 battery with charger, 1 cigarette charger and 1 battery carrying case.
How to determine your Backthing can be upgraded to a Heated Backthing? A: If your Backthing says "Heated Backthing" on the front label and has a Velcro pocket for the heating element on the inside area touching your back. This upgrade kit works for you.
This upgrade kit will not work for the "Perforated Backthing" or the "Original Backthing".