Battery on Network Management Cards.

[mike-s123]

Most (all?) NMCs (e.g. AP9630) have a coin cell battery soldered on them. I can't find any mention of this in the documentation or via a web search. It's a standard BR2032 (?) lithium battery, which isn't rechargeable. So, what's it for, and what happens when it dies?

[Teken · Accepted solution]

The coin cell on the NMC is used to keep the time during a power failure of the system.

If the unit is powered by AC / Battery the coin cell battery will see very little use. If NTP is defined correctly a failed coin cell will be limited to a single time cycle.

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[mike-s123]

Thanks. I was worried it might reset to defaults and become inaccessible without corrective action.