"Still can’t charge anything when in an electricity free part of the world "
There are solar USB chargers, and chargers that operate with a crank. There are USB chargers that run on AA batteries, so you could get one of those with a voltage regulator, and get a solar or crank AA nimh battery charger.
If you want a AAA battery based player, there are the Slotmusic player and Slotradio To Go player from Sandisk. They have no display though, and sound quality is worse than on the Clip+ or Fuze.
