Disable USB battery charge

Hi.
I think that my question is very simple. I want to connet my iPod Nano to my computer via USB port, but I don't want to charge it (I just want to transfer data). This way I make full charge cycles, avoiding charges of little time when I transfer data. Is there some way to disable USB battery charge while my iPod is plugged in an USB port?
Thank you in advance.
Víctor
iPod Nano Windows XP Pentium III 866 GHz HDD 320 GB, 384 MB RAM

I don't think there is. Only thing I can think of is disabling the USB port which would defeat the purpose since then you wouldn't be able to transfer data. You do realize that "full charge cycles" are determined not only in one continous use and discharge, but also 2 or more small charges that equal one full charge cycle. (example: allowing your battery to hit the 50% mark, charging it to full capacity and then allowing it to drain back down to the 50% mark before recharging equals 1 charge cycle, not 2). This is info explained below in the info that I pasted from iPod Battery FAQ's .
Question: What is a "charge cycle"?
Answer: Lithium-ion batteries can be charged a finite number of times, as defined by charge cycle. A charge cycle means using all of the battery's power, but that doesn't necessarily mean a single charge. For instance, you could listen to your iPod for a few hours one day, using half its power, and then recharge it fully. If you did the same thing the next day, it would count as one charge cycle, not two, so you may take several days to complete a cycle. Each time you complete a charge cycle, it diminishes battery capacity slightly, but you can put your iPod's battery through many charge cycles before it will only hold 80 percent of its original battery capacity.

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