Which of the following is NOT listed as a type of aircraft battery?

• A. Lead acid
• B. Nickel cadmium
• C. Nickel metal hydride
• D. Dry cell

Answer: (C)

Nickel metal hydride is not a standard aircraft battery type. In aviation, the batteries you’ll see in the electrical system are typically lead-acid or nickel-cadmium because these chemistries provide reliable high-current performance, good ruggedness, and proven operation across the wide temperature and vibration conditions of flight. Nickel-metal hydride is common in consumer electronics and some other applications, but it isn’t listed as a standard aircraft battery type in the typical references. Dry cells are primary (non-rechargeable) and aren’t used as aircraft main power sources, so they’re not part of the battery types the aircraft system relies on.