The BTI battery for the 5G I posted comes with 2 clear cases to use while your using the battery to power the iPod. One for the 30GB and one for the 60GB. It's thin and has a click wheel cover. The bottom of it is open and there is no screen cover but you iPod won't get scratched while using it. The sides of the battery are resting on the case instead of directly on the iPod.
I'll check the website out and post back.