Oil sucks, wind blows.
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Depends on your objectives.Insulating whole structure will cost more then insulating battery box.With battery on the ground, insulate battery box and jointing flat area (3ft, frost area), should keep your battery above freezing. 1 inch foam. If battery box outside then thicker insulation may be needed.A lot will depend on how much heat your battery produces. Once insulated then venting is important to keep it cool when hot etc. many things to consider.
With freestanding battery, heat may be needed. Normally charging / discharging warms up the battery.Seal it up too tight during a charge/discharge battery may very well over heat.
Have fun,Scott.
Indoors away from sleeping quarters is probably a safe place, too.
One thought I had was to use an old refrigerator for the battery box, but connect up a solar collector and two air tubes to the outside of the shed. During day the natural convection should heat the batteries. The thermal mass of the batteries and the insulation of the refrigerator should keep them "warmer" at night.
You will have to remove the tube or the panel during warm weather so the batteries do not overheat.
Just a thought.