Airbags can deploy after the battery is disconnected because the reserve energy supply can last up to how long, depending on the vehicle?

• A. 30 minutes
• B. 60 minutes
• C. 90 minutes
• D. 120 minutes

Answer: (B)

Airbag systems have a reserve energy source that can keep the airbag electronics powered even after the main battery is disconnected. This backup power is designed so airbags can still deploy if a crash occurs during the period after power is cut, protecting occupants during those critical moments. The exact duration of this reserve depends on the vehicle’s design and the type of backup power used, so it varies from one model to another. In most passenger vehicles, that reserve is capable of maintaining operation for about an hour, though some designs may shorten or extend that window. Because of that variability, the practical, commonly cited duration is around sixty minutes, making it the best general answer.