One of the nice things about the 'old' Ni-Cd batteries is that their performance doesn't drop as much, or as suddenly, when they get cold- at least when compared to some other types of batteries. (Remember the brief fling with NiMH? Those batteries simply turned into bricks at about 30).

By now several of you should have had the chance to run your new Lithium-Ion tools in some reasonably cold weather. How are they performing? Do they seem to lack power or have short run times? Do you feel it necessary to take special measures to keep them warm?