I'd suggest LiFePO4 batteries, as they can source the current necessary for the transmitter easily, and are safer in operation than Lithium Polymer. They can be safely charged on a portable solar panel if you disconnect once the voltage reaches 14.4v, and that's pretty much what the SLA charge controllers do as well. The 2.4 AH packs charge at about 1.5 Amps, so it's hard to bring too big a panel!
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