chuckle Probably a good bet. There may be a microfracture in the cell itself ('course, it might have been caused by the temperature, but still). Usually what happens, is the batteries drain very very quickly (a battery that lasts 10 hours only holds its charge for about 2 hours at -10C, much less in colder temperatures), but after they warm up they get their strength back. Lithium batteries are especially vulnerable to this, because lithium cells relies heavily on heat to function. So for winter shooting, you're usually much better off with cheap, alkaline batteries, which hold their charge a little longer in the cold. - darkpen