Yavapai County Building Code on Battery installation location

I heard that Yavapai County has recently changed the rules on where you can install battery systems. I'm searching through building codes and have yet to find this documented.
What I heard was unclear to me, "energy storage (batteries) must be installed in a separate room with outside access"
not sure what "separate room" means, separate from what?
Has anyone else heard this?
What I heard was unclear to me, "energy storage (batteries) must be installed in a separate room with outside access"
not sure what "separate room" means, separate from what?
Has anyone else heard this?
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NEC 480, and 690, have some provisions. Good Luck, Vic