I am obviously not an expert here
but why would a fuse (or this fuse in particular) be battery powered ?
any ideas ?
some search reveals that owners will be prompted to replace the fuse

munro live teardown actually shows that it is powered by a (smaller sub*) battery (15:44)
https://youtu.be/eYvjVXGBWXQ?t=944*my bad, the wording of the question is a little weird
it appears that a tiny battery powers the fuse circuit which would blow the bigger battery circuit