I have two DualSenses and a charging station with outside source of power - with my play times mostly I only use one since when I finish playing games it just goes back right on to the charging station and is fully charged the next time I wanna play some games, it charges even if my console is off. And the second DualSense is just fully charged sitting there occasionally being used for long play sessions.
I think the last time I needed two controllers were on Hogwarts Legacy and God of War: Ragnarok. Finished Spider-man 2 not so long ago and I think I didn't use second controller at all.
I think my controllers last typically 6 to 8 hours. And lately I don't have longer playtime sessions than that, even on my off days.
I think when I play Warzone it lasts much longer, hyptics off, adaptive triggers off, lights on dim, speaker off, I only use mic to talk with my mates.
I do not think I actually need v2 at all with my current setup and play times.