We have the US Patent for a Blanket powered by a Battery. We manufacture and distribute Battery Powered Heating Blankets for "Soccer-Hockey-Football Mom's, Campers/RV'ers, the Military, 1st Responders, etc. We believe our "WaterProof" Kodiak Battery Powered Heating Blanket would be a great fit for all hunters...whether that be a "Deer Stand" or "Duck Blind"...it provides 5+ hours of continuous heat per charge. (less)