Battery care during travel in hot storage.

[Traveler]

I was wondering how others care for their batteries when situations give cause to store batteries in a longterm hot environment. As an example, if you find yourself needing to store yours in a vehicle where temperatures can be a concern, what if anything do you do to protect them. I have tried double bagging ice packs or frozen water bottles, wrapping the batteries in a towel, again double bagging, and placing both bags into a small soft insulated bag. My concern with this is, the condensation that can form from humidity in the air may be bad for them, hence the use of the towel. Of course now that the stored batteries are chilled, I allow for them to warm in open air before use.

Someone must have a better, easer and safer method, or:
Do you never leave them in a hot environment?
Do you never concern yourself with the heat?
Is the condensation nothing to be concerned with?






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