My high capacity (80 gig) Zune always seems to run out at precisely the wrong time.

I carry my my tiny (2 gig) little Sansa M240, which runs forever off of a AAA battery for a spare. When it does die, a simple battery replacement takes about 30 seconds.

Granted, this may be an apples to oranges (disc to flash drive) comparison, but are there any higher (than 2 gig) portables that run off of replacable batteries?

Thanks guys (and gals)