Fortunately, there are lots of photos and some good comparison shots with the Nexus One.
Although the Desire and Nexus One batteries are very similar, they are apparently not interchangeable.
Looks like someone in China got their hands on an HTC Desire (outside of a tradeshow, thank goodness), and put it through it's paces in a 13-page review. The translation to English is a bit rough, but have a look:
Last edited by theotherrogue; 7th March 2010 at 06:41 AM.