this is why

valhalla360 wrote:

pianotuna wrote:
valhalla360,

Exactly so. I'll be glad when I can get to B.C. to buy 7 or 8 SiO2 batteries.

I'm still not seeing the point of your original post.
- If you need a big battery bank for other purposes but will have access to shore power during extreme cold, there are simple solutions to make lithium work.
- If you don't need a big battery bank and will always have shore power, just get the standard single battery and save yourself a lot of money.

Maybe it would be better if you lay out your use case.

Agreed. This has been described for years, but doesn't make sense to me either. Firstly it doesn't seem like the OP is planning on going camping at -40C. But if he is, it would be very interesting to see what sort of camper could survive this. A mass market RV certainly wouldn't be useable for a whole variety of reasons, lack of insulation, insufficient heat, moisture management, tanks etc.

Secondly, I assume if he is planing on using the camper, he has some sort of auxiliary power and heat, shore power, a generator and a furnace with which to warm his camper. If you are actually going to inhabit the camper, humans, water and food are more temperature sensitive than any sort of batteries.