Even with a garage temp of 45, the OAT Is 19 degrees and the traction battery is marginalized. The battery does not like cold. Observe the yellow dashed lines. These appear during these conditions so as to limit maximum current draw and maximum regeneration, either of which challenges the battery. Normal use creates heat. There is an electric element to provide auxiliary heat if required. When things get up to temp the limiters recede. In the pursuit of battery longevity we see how the system looks after itself.