What is the minimum charge of your backup battery?

• A. 50%
• B. 100%
• C. 80%
• D. 90%

Answer: (B)

Having the backup battery fully charged before use ensures reliability of critical systems. A backup battery is intended to provide power when the main source isn’t available or when you need extra life for essential devices. If it isn’t at full capacity, you risk running out of power when you need it most, which can affect safety checks, communications, data availability, or other essential operations. Charging to 100% guarantees the maximum energy reserve, giving you the best chance to complete contingencies or maintain important functions without a mid-flight power failure. In practice, this means ensuring the backup battery shows full charge and testing it before flight to align with the required readiness level.