Battery draining fast

A fusible link isn't identified by amp rating. They go by wire gauge. 2 sizes smaller than the wire it protects is the practice. OEM link is 14 awg if my memory serves correct.
Fusible links are available at most part stores. Theirs wont include the factories disconnect terminals. Year One sells a complete OEM like replacement.
I wont comment on the maxi fuse substitution since I don't know for sure if that is a good idea or not.