Yes, in fact, the portable generators are batteries in themselves which are lightweight to be carried around for energy purposes. You can carry around a portable generator in your car for a hike and use it to charge your camera or phone. The batteries in the portable generators can be recharged as well. You will need to plug in the unit to the power supply so it can always be at full strength to charge your appliances. While most of the portables generators in the market require a wall socket for charging, some of the smaller generators can be powered with car batteries or by solar panels. It is one of the most trending gadgets that needed in the life of regular travellers and outdoor workers. Check out About Generators to know more.