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.