The colder the temperature, the more impact on available battery capacity. Most Cat phones can be used down to temperatures of -25°C but available capacity will be reduced when compared with temperatures above 0°C.
It is important to understand if a phone is fully charged before being exposed to cold temperatures, the phone will work until the phone temperature reaches -25°C (albeit with reduced battery capacity). If the phone temperature reaches -25°C, the phone will power off.
Cold temperatures affect battery charging. Our phones will not charge when the battery temperature is below 5°C. At 5°C, a warning “Warning! Battery temperature is too low” will pop-up. The phone can still be used but charging will be blocked until the phone warms above 5°C.
Above 5°C but below 15°C, the battery will charge at a slow rate. At 15°C and above, the battery will charge at a fast/normal rate. Preventing the phone from charging at cold temperatures protects the battery and phone.
Note: Without this protection, the battery is prone to develop an internal short resulting in a near-immediate release of stored energy that can cause a possible fire, damage to the battery and phone, property, or personal injury.