What are the safe operating and storage temperatures for the G1?

The recommended operating temperature range is between -10°C and 40°C (14°F to 104°F), and using the device outside this range can temporarily affect battery life or device behavior. For storage, keep the product in places where the temperature is between -20°C and 45°C (-4°F to 113°F), as exposure to temperatures outside this range could permanently damage the battery. The appropriate charging temperature range is 0°C to 40°C (32°F to 104°F). (Page 7)