DW loves to shop in dollar stores. Worse, she's an accountant and cheap is always best. :( I'm sure that's where she would've got them.
I just have to laugh at the "super heavy duty" labeling and then "ideal for low drain devices" in small print in the corner, both on the front of the package. :R
I saw a comparison of alkaline batteries (consumer reports?) a few years ago that concluded there was little difference between most brands & prices so spending more $$ doesn't necessarily mean longer life.
I'll check out lithium ones.