What role does a backup battery serve in an alarm system?

A backup battery is a crucial component of an alarm system, primarily because it ensures that the system remains operational during a power outage. When the main power source is interrupted, such as during a blackout or a cut in electrical supply, the backup battery kicks in and continues to power the system. This functionality is essential for maintaining security, as alarm systems need to be fully operational at all times to effectively monitor for intrusions or emergencies.

While there might be other features in an alarm system, such as alarm sounds and communication capabilities, the purpose of the backup battery specifically addresses the need for uninterrupted power, allowing the system to function as intended even when external power is not available.