i was out for the first time sunday with my scope. it was about +5C out and i had no illumination of the reticle. brought the rifle out today to clean it and it worked again. does the battery fail when its cold out should i have a couple in my pocket to keep them warm and swap em out when i need it? any one else have issues in the cold? Oh and i got to say unfricken believable optics i have ever looked through.