I was thinking if it's possible to use two AAA batteries to replace a lithium coin backup cell.
It's not a new design, but a "cost cut" in an old design that needs to start going again.
The device in question draws 10uA from the battery for backup purposes, which should fall well below the self discharge characteristic of the AAA cell.
I'm asking this question here because there were low (10's of mA) to high (100's of mA to 1' of A) discharge curve characterizations of those cells, but not uA in the many battery datasheets that I've found in the net
There is no battery leaking concern, nor size, nor space. They will be glued to a part of the enclosure and attached with wires.
What really matters is what backup time may I expect for AAA carbon alkaline cells with a 10uA load