RX1 Battery Life?

I got my RX1 last week and hadn't had much of a chance to use it, but I did today, and to be fair its cold out 22F. I used my fully charged RX100 battery in it, but I got like 20 shots before it claimed the battery was exhausted. I was using AF but only really had the camera turned on for seconds during the photo taking process, I didn't do any reviewing.

Now I'm guessing it really just down to the cold, but 20 shots is mad... I would get at least 100 out of my nex7 in the same temps, and about 200 from my A900.

Out of curiosity  what kinda shot quantities are other RX1 owners experiencing in more reasonable temps?