http://www.boxwave.com/products/easyfinder/products-for-creative-nomad-jukebox-3_625.htm
I came across this while digging around on Amazon.com. Boxwave has quite a few things for the JB3, including a AAA battery pack that they claim will "provide up to 5 full recharging cycles for your device." They have a bundle with an AC charger, car charger, battery charger, and CPU charger that runs about $50. It looks promising, and it could come in handy if it will charge your battery for 5 cycles.
Nice score! Those look very interstering!
Terry