I would think it won't as long as the polarity is correct, my understanding is that the WRT54 converts it down to 3.3v anyway. But one of the more electrically savvy guys might want to chime in before you trust me.
I've been following this for the past two months and today finally got around purchasing the parts to put it together. I haven't purchased the PCB board yet and I'm looking to see if someone has an extra one I an buy or not before I order my own through Dorkbot.
Thanks for any assistance.