What is the standard voltage of the battery in an aircraft's electrical system?

The standard voltage of the battery in an aircraft's electrical system is typically 24 volts. This higher voltage allows for more efficient starting power for the aircraft's engines and operation of electrical systems, such as lighting, avionics, and other essential components.

In aviation, 24-volt systems are common because they provide a good balance between weight and performance. While some smaller general aviation aircraft may operate on a 12-volt system, the majority of modern aircraft use 24 volts to ensure sufficient power delivery and to support more demanding electrical loads.

The other voltage options are utilized in specific scenarios or different types of smaller aircraft, but for standard aircraft systems, 24 volts is the accepted norm.