From what I have been able to dig up online is that SMF batteries only perform well till -20°C, but I need to install a weather station in an area with temperature of -40°C. Can anyone suggest how can I possibly achieve it. Please note i can’t use a heater of some sorts because most location won’t be having access to direct power supply. the battery will be enclosed in an IP66 NEMA4X enclosure.
Any help in this regard will be deeply appreciated.