Where is the stand-by battery located in the Cessna 172?

The stand-by battery in the Cessna 172 is located behind the Primary Flight Display (PFD). This location is strategic, as it allows for a backup power source specifically designed to support critical avionics and flight displays in the event of a failure in the primary electrical system. By positioning the stand-by battery close to the PFD, the aircraft ensures that essential flight data remains available to the pilot, enhancing safety during flight operations.

It is important to note that the other locations mentioned would not be ideal for housing the stand-by battery, as they would either be difficult to access or would not be near the critical systems they are intended to support. The under-pilot seat location is primarily used for other equipment or storage, while the left wing and engine compartment are unsuitable due to concerns regarding environmental conditions and accessibility.