Battery pack for EOS 5D

[Auré]

Hi,

As I plan to go to bolivia in few weeks (almost in south Lipez where it's very cold), I'm looking for a solution to protect my batteries from minus temperatures (around -15°C at night).
Is there a solution like the image below ?



It would be the perfect solution as I can keep warm my batteries in my bag or my jacket. But does it exist for 5D ? May be other solution ?

Thanks for your help.
regards

[michael]

Since the 5D's batteries are so small and relatively inexpensive, why not just buy one or two spares and keep them in an inside pocket. Swap them with a cold battery in the camera when needed.

No cable and other issues to worry about.

Michael

[Auré]

Yes, it could be a solution for a short moment, as long as the batteries are not getting cold. But for a 5 days trip without electricity and very cold temperatures, I'm looking for a better solution. Otherwise, I'll take 2 or 3 spares with me.

sorry for my poor english