I don't think should be a problem at all man. I think heat will actually affect it more than the actual cold. If you leave the batteries in the cold for a whole day then yeah maybe, but when they are in your pocket and stuff they should be fine. As for the rain well to be honest PV a lot of them dont have many openings when fully assembled, that doesn't mean you can swim and vape but if you can try to avoid the rain getting it the better, remember you are using an electronic, is the same as in using your portable dvd player in the rain. The good thing is if a few drops hit it you should be fine, now you can't like put it under the water no.