Nice! I really like Google Glass, the only issue I have with it is the reduced battery life. I wish there were a supported way to replace the battery. Or is there?
The company that made it still has its website up, but there doesn't appear to be a way to order. So they may be out of stock. But you could always try to contact them, I suppose.
In a similar vein, I guess you could always get an USB battery pack and a thin USB cable that's long enough to reach to your pocket. I don't think it's ideal, but it might be better than nothing.