Not really sure, to be honest. Aside from every single update ever (any version) and the days immediately after, I just don't run low on battery. I guess the iPhone 13 Pro Max battery is massive, so you're likely to have a different experience.What about battery life for you compared to 15?
Since I do a few hours of driving per day and use CarPlay, I only plug it in at night about half the time.
(Before you ask, CarPlay is still functional but has countless tiny and infrequent bugs. Just like iOS 15. I wish they'd fix it.)
eta: Now that I think of it, I have this vague memory that I had to recharge most nights with iOS 15. But YMMV, and my memory might be wrong.
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