What would be interesting to see is the balance of energy cost for battery heaters. Is it better to use some electricity to warm up the battery just slightly to

What would be interesting to see is the balance of energy cost for battery heaters. Is it better to use some electricity to warm up the battery just slightly to get more power out of it for longer? There's probably a sweet spot there. I imagine similar with cooling, except there the "end of range" scenario is more.. dramatic.