Update- new info added and another question-B300k-proper discharge and recharge

Question:
I have an AC300 and three (3) B300 batteries…I just purchased a 4th, a new B300k battery and hooked it up…no problem… So now i have 4 batteries operating.
I want to discharge all of the batteries to zero (0), have it shut off as required, AND then recharge as specified by the AC300/B300 manual for 2 reasons; to sync all of the batteries, and to discharge every 6 months as required by the manual…
However…The B300k manual states do not discharge below 1%, AND, then it says if you discharge below 1% (meaning off) immediately recharge (grid).
So the question is, what is the proper discharge method for the B300k?
Thank you.
Update: I ran all four batteries down to zero and everything shut off as required… when I plugged the AC300 into the grid the three B300 batteries all automatically turned on, the B300k did not, and had to be manually turned on… the manual says on page 10 it will automatically turn on … is this because it was at zero or something else?