Hmnnn, I think obscure batteries that are hard to obtain in regular circumstances are not going to be any easier to obtain during an emergency. And one hopes that you've already stocked up on batteries in advance. (I certainly have!)
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In the last big blackout in Somerest, England, AAA, AA,C, and D cells were in short supply from retailers.
The local electrical trade supplier had ample stocks of AD28 batteries, of "door bell" batteries,electric fence batteries, and very expensive 3.7 volt LITHIUM D CELLS.
The local pub was lit by a variety of lights that I loaned them, mainly kerosene pressure lanterns, and small 6 volt incandescent bulbs worked off electric fence batteries.
As you point out it would have been prudent to stock up first, and I had done so, but others were less well prepared.
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