D800 eats batteries!
When I first got the D800 I thought the battery was drained easily as well. But I did not use it much and kept my batteries charged all the time. So when I did use it I noticed its life seemed shorter. Well a few weeks ago I shot a wedding with it and it WAY out performed my expectations. I got around 1600 shots and I still did not kill it, even by the end of the night, 8 hours of shooting and no kill is AWESOME for me. and I had a spare in my pocket the hole night and did not use it. This is the best camera Ive used yet. Ive had no issues with it so far. The AF in the dark blows me away. I can grab focus on the slight light bouncing off eyeballs with this little guy. Super impressed.