What is the minimum battery temperature for takeoff?

The minimum battery temperature for takeoff is crucial for safe operations, particularly in aviation practices involving battery-powered systems. A temperature of -20°C marks the threshold below which the performance and reliability of a battery can start to degrade significantly. At this temperature, the chemical reactions that allow the battery to generate power can be slowed down, leading to insufficient power output necessary for takeoff, which can result in operational failure or reduced efficiency.

Batteries can tolerate lower temperatures; however, performance at these extremes can be unpredictable, as the cold can impact not only capacity but also the ability of the battery to maintain consistent voltage levels. Selecting -20°C as the minimum ensures that operational temperatures are within a range where the battery can effectively power the aircraft systems. This choice prioritizes safety and enhances reliability during critical phases of flight, such as takeoff.

In contrast, temperatures above -20°C are generally more favorable, but that does not set the minimum threshold for safe operations. Choices such as 10°C and 0°C are too high to represent a minimum requirement and do not address the operational limitations faced in colder environments. Thus, the decision to define -20°C as the minimum reflects a balanced consideration of safety, performance stability, and the operational environment