Don't be fooled! Truth is, battery operated space heaters don't exist yet...current battery technology can't provide enough power to heat much for long. The next best things are the portable, gas powered space heaters or small plug in heaters. Some of these can heat a car, a tent while camping, or a small room at home. Smaller ones may keep you warm at a desk. Check out these top rated space heaters, read Amazon reviews and see if you find one you like!