Outboard battery charger?

[LeroyBanjo]

Does anyone know of an outboard battery charger for the Zen Xtra battery? My Zen works fine, except it won't charge -- I plug it in and nothing: No splash screen, no "battery is charging" icon...zilch. I left it like that for a few hours, hoping that maybe it really was charging, silently, but nope. I tried the wall charger and the USB charger -- neither one works. I have a couple of batteries, so if there's such a thing as an outboard charger, that would solve my problem -- I'd just keep one cooking in the charger while I'm playing the other one, and then swap.

Alternatively, is there a trading post forum? I'd be willing to buy a Zen that only charges the battery but otherwise no long works.