This battery lasts the life of the router under the operating environmental conditions specified for the router, and is not field-replaceable.
But who determines its lifespan?
Knowing there is a battery set to fail and I can’t simply replace it makes me physically uncomfortable. Enough so that I’d rather it not have RTC.
Thanks Cisco.
If you think that’s bad, some old arcade cabinets had suicide batteries. Their only purpose was to keep a sram chip alive that held a decryption key. Battery dies? No more game for you.
(with type covered as a bonus)
Relevant fact: Most standard non-letter batteries are named after their physical size, for example a CR2032 is 20mm diameter x 3.2mm height; or not a button battery, but an 18650 is 18mm diameter x 65.0mm height.
Generally the chemistry and any features of the battery.
https://wikipedia.org/wiki/Button_cell#Type_designation
C means Lithium. The R means Round.
The IS IEC spec that defines the coding is 60086-3
But who determines its lifespan?
The RTC battery, obviously.
The Cisco tax sure is spent in weird ways.
But knowing Cisco, the router would be unsupported and with some unpatched zero day vulnerability when the RTC battery dies…