What are the battery specifications?

What are the battery specifications?

• A. 24 V direct current, 44 Ah nickel-cadmium (two)
• B. 28 V direct current, 60 Ah lead-acid (two)
• C. 12 V direct current, 100 Ah nickel-metal hydride (two)
• D. 24 V direct current, 100 Ah nickel-cadmium (four)

Answer: (A)

The main idea is that the ERJ-145 uses a 24-volt DC battery system with two nickel-cadmium batteries, each around 44 Ah. This setup provides enough energy to start engines and APUs and to supply essential avionics when external power or generators aren’t available. Nickel-cadmium cells are chosen because they deliver high surge current, perform well in a wide temperature range, and have a long cycle life with relatively low maintenance, which is crucial for reliability in an airliner environment. The other options don’t fit because the aircraft isn’t designed for 28 V DC, and the combinations of higher or different chemistries or more batteries would imply a different system design than what the ERJ-145 uses.

The main idea is that the ERJ-145 uses a 24-volt DC battery system with two nickel-cadmium batteries, each around 44 Ah. This setup provides enough energy to start engines and APUs and to supply essential avionics when external power or generators aren’t available. Nickel-cadmium cells are chosen because they deliver high surge current, perform well in a wide temperature range, and have a long cycle life with relatively low maintenance, which is crucial for reliability in an airliner environment. The other options don’t fit because the aircraft isn’t designed for 28 V DC, and the combinations of higher or different chemistries or more batteries would imply a different system design than what the ERJ-145 uses.