Charge Clip Zip or Plus with 30-pin cable

[Sansaguy12]

My gym on their treadmills have apple 30-pin male connectors for apple devices. Sometimes I forget to charge my Sansa Clip Plus (and my soon to be delivered Zip). I found this 30-pin female to USB male cable:

http://www.cellphoneshop.net/f30pin....FSQbQgodlDTyEQ#

I could then easily find an adapter for the USB end of the cable to connect to the Clip. My question is will this be safe for the Clip? Or, I could just keep a small battery backup in my bag. I hate to workout without music.

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