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.
Not half as bad is potted in RTC batteries. As in: The RTC chip and battery are inside the same epoxy-filled package. The bane of vintage SUN hardware (and some PC clone manufacturers in the 386-486 era) collectors.