I shot my 100s down to -30 and it was fine. The batteries last about 1/4 the time they would normally, but if you put them in your pocket and heat them up, they get a little more life as you rotate through. Don't ever let the batteries get too cold, I'd even suggest rotating them as you shoot to keep them warmer perhaps. My Fuji, after this experience however, in normal shooting now seems to have a glitch where sometimes when I'm shooting, it simply stalls out and doesn't take the shot. Maybe 1 out of 100 shots. I'll probably end up sending the damn thing to Fuji for diagnostics, but the problem is obviously somewhat challenging to replicate as it does it seldomly while shooting, and essentially the camera is still usable and functioning.