What is the safest temperature range for charging and storing the FC2 battery?
Charging the device below 0°C may cause unexpected damage to the battery. Battery storage temperature should be between 5°C and 20°C (41°F to 68°F). The operating temperature range for the controller is -20°C to 50°C, and storage temperature is -40°C to 65°C. (Pages 3, 6, 20-21)
From the official Efix Fc2 Handheld Controller manual, page 3
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