1 Creative Zen Xtra
1 Pecularity in the design of the lithium-ion battery in the Zen
2 Pages from the creative labs website advising how to deal with batteries not charging
Leave your Zen in a box under the bed for four months
Notice that the battery is no longer charging when you plug it in
Read and follow the advice on the Creative labs website about clearing the OS from the machine and cleaning up the hard drive
Attempt to install the new OS/firmware
At this point, the software should helpfully point out that you need to charge up your battery before the firmware can be upgraded. Take note of the paradox here.
Search the forums for less official advice.
Discover that the Zen battery does not contain the necessary hardware to prevent it from discharging completly
Discover that the Zen battery does not now contain the necessary charge for the Zen itself to notice it.
Put your now entirely useless Zen back under the bed until you can find somewhere selling replacement batteries.