It will work with wet branches and I’ve used it at -25 and have had no issues. Like KRider said, to start it using only wet branches would be challenging but is very doable. I’ve always started mine with strips of birch bark and twigs and wet or dry, hot or cold, never had an issue. The only thing I haven’t really done with mine is charge devices....I’ve tested it and it charges but I have no idea how long it would take to charge a phone, gps, etc. I would guess that this newer version probably does a better job at charging devices just because that seems to be a priority for more people these days.