The photo reminds me of listening to Radio Luxemburg on long wave in about 1955 on a "portable" radio - a valve set, of course. The valve heaters used a 9v lantern battery and the HT was provided by a 110v lead-acid battery, charged each day at the local garage.

I still think my Samsung phone is the most convenient solution. If the battery did need charging, solar battery chargers for phones are widely available.

Phil