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I'm running a Milwaukee Fuel 18 and this past weekend I left it connected to my conversion Nils in the back of my truck on the ice. It unexpectedly got to -12 degrees over night and by morning the battery was pretty weak. I didn't try, but I doubt it would have completed a hole in the 30+ inches of ice. I have used it at various time throughout the day at 10 degrees with no noticeable effect without warming it up.
Congrats, you got a heck of a deal.