It could be the battery, Bob, but the thing has an inbuilt, non-removable battery.
Personally, I think the iRiver H120/140 series were the finest things they ever produced, and the best hard-drive based MP3 players, hands down. Whilst I love the iPod interface, iTunes (mandatory to use the damn thing properly) turns me off with its hoops, hurdles and silliness. The iRiver had the technical specs of the iPod, plus longer battery life, builtin recording and FM stereo, and it presented as a hard drive to Windows and FreeBSD. I don't like the new interface on the H10 series at all (though they are pretty), but that's the way I'm leaning unless something better is suggested.