You can buy a rechargeable battery pack that comes with the wall-wart/plug pack charger for a lousy $30 on Amazon. These are designed for mobile video cameras, etc. Some have a little LED display that shows charge status of the pack. I paired this Tech 21 Fly Rig with a Talentcell-brand 12v battery pack (the FR requires 12v). The steel handles prevent stepping on the plugs and breaking them off. This little board will run for more than 40 hours on a single charge. You can get these batteries in several voltage ratings, including 9v.