The recommended operating temperatures for the Battery is:0 degrees to 90 degrees Fahrenheit (-17 degrees to 32 degrees Celsius)Do Not Store the Battery in Direct Sunlight!  Storing the Battery in the trunk of a car is fine, even on a relatively hot day. The recommended operating temperatures for the On-Board Electronics and Motors is:-49 degrees to 150 degrees Fahrenheit (-45 degrees to 65 degrees Celsius)