In a "pure" radio that assessment is probably correct, minus any loss due to wire resistance.

I had a portable radio with a missing battery adaptor but two wire stubs so I assumed it used a 9 volt and I grafted on a 9 volt connector. The radio worked but became hot as heck, due to improper wire diameter for the voltage. It was probably made to use 2 AAs (3 volts) in the little plastic holder they make for some of those small portables.

Your Yachtboy will also draw power for the LCD display and perhaps even certain digital memory functions take some juice as well. I had a SONY sw radio similar to the Yachtboy and it used 4 AA batteries and would last about 3-4 days of solid listening on conventional batteries. Lithium batteries weren't yet available, but I would imagine that they would last about twice that long.

Everytime I think of Fidel, I can't help but think of Peter Falk playing him in the Twilight Zone episode...looking at his enemies in the mirror, until he finally just sees himself. Castro must hate that episode...

;-)