> Both bathroom and kitchens scales are large enough they can run on AA / AAA batteries and casually go a decade (or more) without replacement.
For bathroom scales, sometimes the design doesn't permit batteries larger than button cells, since the entire scale is a piece of tempered glass with four 1/4" tall feet and a lighted LCD display that shines through the glass. I like this particular design because it's thin enough to fit under a door as it swings. Batteries in my scale last over a year with near-daily use, and mine has a very bright display.
My relatives have a similar type of bathroom scale.
When the button cell ran out, I popped in another one we had lying around.
One month later, the button cell was dead, after using the scale a handful of times. Obviously something was draining the button cell battery when the scale wasn't in use.
I could try and debug the scale, but given that even ten minutes of investigation would be more than the amount of time I spent using the scale in one year, I just decided to remove the button cell when the scale wasn't being used.
Two years later, that button cell still works in the scale...
For bathroom scales, sometimes the design doesn't permit batteries larger than button cells, since the entire scale is a piece of tempered glass with four 1/4" tall feet and a lighted LCD display that shines through the glass. I like this particular design because it's thin enough to fit under a door as it swings. Batteries in my scale last over a year with near-daily use, and mine has a very bright display.