My stealth runs awesome in the cold, and I'm in Northern Wi. I have it set up to run on a 12V marine battery. On one hour of charge, it ran for two full days, highs of -20 and lows of -40, and took nearly 500 pictures, almost all using the flash. I would assume that with more charge, it would have lasted a lot longer.

here is a link to a post where we discussed the stealth into some greater detail at Jesses.

Stealth Digital Modifications