@crazyguy Temperatures here regularly drop below -20C -4F. A quick search for temperature effects on LIIon batteries will produce many articles with details. Source: Science Direct
I keep my cars outdoors. I suppose If I stored it inside and left a heater on in the garage it would be ok. But why bother? My gas Subaru starts and runs great. Turn the key and Vroom!.. I don’t have to think about it.
“Graphical abstract
Lithium-ion batteries (LIBs), with high energy density and power density, exhibit good performance in many different areas. The performance of LIBs, however, is still limited by the impact of temperature. The acceptable temperature region for LIBs normally is −20 °C ~ 60 °C. Both low temperature and high temperature that are outside of this region will lead to degradation of performance and irreversible damages, such as lithium plating and thermal runaway. Therefore, understanding the temperature effects and accurate measurement of temperature inside lithium-ion batteries are important for the proper battery management. The state-of-art achievements in monitoring the temperature inside the LIBs can be divided into contact measurement and contactless measurement. This review overviews recent development in both the understanding of the temperature effects and the temperature monitoring, and discusses the challenges and possible future directions in achieving optimum battery performance.”