The ones I have in mind were the blob chips for clocks, remote controls, pocket calculators, thermometers, wrist watches and such, with LCDs. Those were very, very low power. Still have a few such devices. Last time I've changed the batteries was 3-5 years ago, don't remember, and they are still working fine. Maybe those were not CMOS, like a 6502, that's why I'm asking.