Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
Mine came out of the box @ 75 percent. A couple hours later I thought it would be a good idea to unpair my phone from it. When I tried to re-pair it, it said the battery was too low and I couldn't get past the Language setup screen. Once I "plugged" it in, it was able to get past that screen immediately.

Which means it has to be at least 50% or more battery to pair successfully.
 
Mine came out of box at 71%. Been playing with it a ton since I got it around noon and it's at 50%.
 
Mine came out of the box at 90% LOL. I apparently got lucky with a mostly charged battery.
 
Mine arrived at 75% battery. I'm on 35% now, 5 hours later, which isn't too bad really considering I've been playing with it almost constantly...
 
Mine came in at 70% battery. I played around with it for a few and then threw it on the charger. I want it fully charged before i head out later on.
 
Mine came with 80% when I opened it at 7pm. Its now 10pm here and on 50% but I have been non stop playing on it so I don't think thats too bad.
 
Mine came 75% charge. I had to get a few things done so I did let it charge up to 100%. I figured I would be using it a lot today with it being new so starting out fully charged would be a good thing.
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.