I don't think cold climates will be that different here. grid scale storage doesn't care about outside temp because heating/cooling a warehouse is pretty cheap
A lot of BESS enclosures (sub grid scale, and grid scale) are much more primitive than a warehouse. If you don’t need to pay for HVAC, it’s free money for the operator.
You can also put internal heaters within the battery compartment itself, as with current EV batteries, and have the batteries manage their own temperature automatically.
Heating and cooling is pretty energy-intensive, which comes right out of the marginal profit of owning batteries. They might as well hook up the heating/cooling system to the batteries.