Mild Hybrids are not exaclty battery operated (as far as I can tell) as in they cannot just run on a battery, but they certainly can be a very helpful boost to power when needed.
For true 'hybrid' even those that do modest mileage in fully electric, the 'use case scenario' really needs to be fully checked out.
~ For me, just about perfect, as I have circa 15 - 20 mile range depending on outside temp, and that very easily covers my daily commute, even with aircon, heated seats and steering wheel all full on It is 'pre conditioned' before I drive off.
Home or close by charging will be essential to make the most of it.
For distances, especially when I want to make the most of its efficiency, pre programming the sat nav with destination and way points, then setting off in hybrid, the car knows when to deploy electric and or engine, usually running out of stored electrons on arrival at destination (they do re gen as well, which is a boon).
The biggest fun - at least for me, hitting sport and booting it. That just then gives full power from both power units. (The battery is never allowed to go 'fully flat' and keeps an amount for just such occasions)
Somewhat startling the first time you try it, and not something I do with any regularity.
Driving to work in silence, on a frosty moring like today, in a fully up to temp car when you clamber in, is quite something I have come to enjoy.