LOL -- after reading this post I started looking at Sony AM/FM pocket radios and found the Sony ICF-S10MK2 Pocket AM/FM Radio -- duh!! I have that radio in the truck's survival kit, batteries removed. Good radio, I won't say bombproof, but close to it. The 1xAA non-prison radio Blast linked to gets more time on a single battery but it's using a small headset (3.6mWx2) rather than a speaker (100mW). With a headset I'd expect the battery life to significantly increase.
FWIW