How to prevent the battery flat easily during winter?

np.

scepticswe wrote in post #8923033
It is important to realize that the battery does not drain faster because of cold temperatures. Actually, it's quite the opposite; the battery has a hard time delivering the power when its cold and all the electrochemical processes run slower. If the battery "dies" when its cold it simply means that it cannot deliver power, not that the power has run out. By heating the battery (inside your glove or a pocket close to your body, where it's warm) the battery should work fine again. Then again, it's never a bad idea to carry a spare battery with you, preferrably stored someplace warm, such as a pocket inside your jacket.

Yes, this is the ticket. Take more than one battery, all of them fully charged each day. Put one in the camera, keep the others in a pocket close to your skin. When one battery starts to show signs of the cold, swap it with one from your pocket. When the chilled battery has warmed again, you will be able to use it again. You can swap two or three batteries like that all day, until each finally exhausts its full charge.

snoopy198520 wrote in post #8923059
the only worries is the lens and the camera alot of them i have ask. they ask me to prevent the lens from condensation. how do i prevent it when i get into outdoor to indoor and indoor to outdoor what i have to look out for?

You only have to worry about going indoors, which is where any condensation will occur. If you don't expect to do any shooting indoors for a while (or you plan to go immediately back outside), just put the camera in your bag before you enter and keep it in the bag. I will warm by conduction without condensation.

I have shot all day in -25 temps on 1 battery, the cold just isnt an issue, well for me it was but not my gear!

The age of your batteries has a lot to do with it The older and more cycles a battery has , the more cold or /heat effects it / them . I would buy a new battery [2 if gripped] before you go .
A lens filter wallet , compact flash card wallet will both hold spare batteries [I use the bright yellow compact flash card holder - easy to find because of color and fits into pocket .]
BTW- if you use filters , take at least 2 of each you take . easier to replace than clean - but have had them stick when below freezing - so get a plastic filter wrench [less than $10]