Just had another dead Lithium battery bite me. Its is in a "CyberPower 650VA Backup Utility Powerboard UPS" was not a high end one of course./
It was used to supply a tiny control board. The sub 1 second change over if grid failed from Grid to my Flow batteries some times killed the tiny control/display which managed the two Victron inverters I have in parallel.

Sub 3 years old.

Most UPS batteries have lasted 5-10 years for me! A button battery would have enough power for that tiny part getting a back up on my Back up

They are replaceable- Not on Saturday at about Midnight when I found it

EDIT- RBP0063 is lead acid! OMG I knew I grabbed a cheap one