[chankh11]

Don't know any Cold--Resistant Batteries
都係個句: 經常 "warm it inside the pocket of my fur coat" untill you need to take it out for photos. Then back to "warm it inside the pocket of my fur coat".

[arcticwind]

NiMH batteries can withstand a wider range of temperature but heavier than Li-ion. That's why it's used in Canon's professional 1-series cameras despite of its weight. Wider range doesn't mean it's cold-prove though, but -10C won't be much problem.