What should be done if the battery voltage is recorded below 22.5 V?

When the battery voltage is recorded below 22.5 V, it indicates a potential issue with the battery's capability to support essential systems. An undercharged or failing battery can lead to difficulties in starting the aircraft's systems and may result in a complete loss of electrical power.

In this situation, it is essential to report the irregularity and refrain from departing until the situation is resolved. This ensures that all electrical systems are functioning optimally and minimizes the risk of in-flight emergencies caused by electrical failures. Taking action by not proceeding with the flight is a safety protocol designed to protect both the flight crew and passengers.

Resuming normal operations or conducting a battery charge might lead to critical failures during flight, while lowering the landing gear does not address the underlying issue of low battery voltage. Hence, the correct action in this scenario is to report the situation and ensure safety before considering further steps.