My daughter-in-law sent me an email with a video that has the following
advice:

Instead of paying 5 bucks or more for a package of four, AAA batteries, buy
a $4-$5 , 6 volt lantern battery instead.

These are the ones that are about 3" by 3" by 6" and have the spring
electrical connectors on the top.
Remove the label, pry off the top of the case with a screwdriver and snip
the internal wire connectors going to the springs.

Invert the case and dump out 32 brandy new AAA batteries.

Eisboch