George bought a morse code CW radio, but he needs a battery for it. It runs on 9-12 volts. He needs to have a portable battery supply because it's for backpacking. Leo says going solar would be a good option as well. The trick, though, is that they are grossly inefficient. So he'll need a larger array than he thinks.
George should check out GoalZero.com. He should also check out the BioLite Camp Stove, which doubles as a battery charger. It uses the heat from the stove to charge devices. A power brick from Anker would also work.