The Cisco ASR 9000 Series switches utilize a lithium coin cell battery. This battery type is commonly employed in networking hardware to maintain the system’s real-time clock (RTC) when the device is powered off or rebooted.

A reliable Real-Time Clock (RTC) is crucial for the smooth operation of ASR 9000 series switches, enabling essential functions like logging, scheduling, Network Time Protocol (NTP) synchronization, and security auditing. To ensure uninterrupted operation even during power outages, these switches utilize a lithium coin cell battery. This battery type excels due to its low power consumption, long lifespan, and compact size, making it ideal for powering the RTC continuously. In the event of a power failure, the lithium coin cell battery keeps the RTC running, preventing data loss, maintaining accurate scheduling, and enabling seamless resumption of operations once power is restored.