I don't see the point of this type of gadget unless you're going to some remote area for several years or something. For a BOB, I'd say use a normal AA or AAA powered radio, with lithium batteries if you're concerned about storage life. Countycomm has several nice radios of this type, which have shortwave coverage. They will all run for dozens of hours without a battery swap, plenty for several days of several hour a day listening.