Thanks,
During those 2 weeks, we got half a meter of snow in 2 days, then it went below -20C for about 3 days.
The SB-22 flashes were to my surprise still in standby (with standard AA Eneloop NiMh) as was the camera. The camera and flash enclosures were frozen solid in an ice cladding, so I took them home to be able to retrieve the memory card, and to charge batteries. Youngnuo flash triggers were dead, despite external AA Batteries.
That is the life of a camera trapper in the north.