I think someone in that other Denon tread already did that, and was told the headphones would have to be sent in for a repair. And with a 1-year warranty, that's kind of pointless as the battery will probably last at least two years. But I keep headphones a LOT longer than that, so I think the non-replacable battery is a showstopper.
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Also as a matter of principal, I don't want to support products without replaceable batteries. The only exception for me is the iPhone, and I usually upgrade phones every time my 2 year contract runs out, so it's not so much of an issue... I still won't buy and iPad until they put a replaceable battery in it (and add USB).[/size]