You should be fine, It gets cold up here in Canada and minus 30 prob. isnt the best temperature, but -15 Celsius (5ish Fahrenheit) kept in a pocket or deep in your backpack is fine, and make sure your drip tip isn't threaded, that could be a tongue-on-metal pole situation, if anything you'd get a slightly better battery life and probably way better flavour in an RDA with the added heat loss.