A23's show at $7.00 for 2 at Walgreens so I guess it's down to how long they last
I get them in a supermarket for $1.60 but I know they cost about $7 if I go to places that sell garage door openers (which is where you usually find them).
which would go back to that backlight.
Just to be clear, it's the "Mini" that uses A23s, it doesn't have a backlight.
The M1 (
with super backlight) uses 9V PP3s.