Does Case Relay work well in cold weather/hot weather?

The Case Relay’s internal lithium battery is best charged at temperatures between 0°C to 45°C (32°F to 113°F) and discharged in temperatures between –20°C to 60°C (–4°F to 140°F). Do not charge when weather is below freezing. The Case Relay’s internal lithium battery will charge and perform well at higher temperatures but may experience shorter life.