Mr. Heater HERO35 Portable Propane Heater, MH35CLP: * New cordless forced-air propane heater delivers up to 8 hours of warmth from an internal rechargeable battery * From remote fields to garages and tailgating to construction sites, the Mr. Heater HERO provides powerful, quiet spot heat wherever you need it * Can reach up to 35,000 BTUs in an hour