I was also talking about working conditions. A lead-acid battery can work decently well in conditions right down to -60F. I've started a car that was stored in conditions that will leave the lithium-ion batteries as useful as a brick. (A few days ago, my wife's car started at -25F (~-30C) without any heat to the battery or engine.) About 15 years ago, I was working on a power cart intended to provide continuous cathodic protection to a pipeline in arctic conditions. We were able to design the system so that (with a small margin) the batteries could be stored outdoors without additional heat down to temperatures of -70F. Again, these are working conditions at which lithium ion batteries can't be made to work without difficult and potentially costly adaptations. You may think these fringe cases, but for me these are quite common conditions.