Lithium-Ion batteries power really drops off when cold. Here in northern MN, I am talking -20F and colder. I use my cordless EGO blower (non-snowblower) for light fluffy snow on the front and rear decks of my home and keep it inside. If I use it for longer periods when the battery is cold, my time diminished dramatically. I am skeptical on how long even the largest battery will run in extremely cold temps. I own multiple snowblowers from a 54" tractor mounted to a pair of electrics. I would really like to ditch the cords and if I could get an idea of a reasonable amount of run-time to expect in sub-zero temps, I would consider the Ego-blower as an addition to my current Ego tools.