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The problem with cheapo callipers is they're on all the time (even when "off") in order to keep track of their position, so the battery is always dead.
Do you mean the cheaper ones cannot be manually turned off when they are not being used, or just that they don't auto power down when left idle for a while?
Nick_S-
They have an "off" button and they may even auto power off, but all that does is blank the screen. They're still tracking the position of the slider and that's what consumes most power. Any time they have a battery installed they're draining it as fast as if they were fully on.
If they didn't do this they'd lose their zero position every time.
grams
The problem with cheapo callipers is they're on all the time (even when "off") in order to keep track of their position, so the battery is always dead. Genuine Mitutoyos* have a more complicated sensor track that allows them to actually power down.
(* there are lots of shameless fakes)