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So it turns out "the phone has a physically larger battery — a fact about the new iPhone SE that the company confirmed on background in a group briefing with reporters." When teardowns are published we can see exact mAh.

See https://www.theverge.com/2022/3/8/22967821/iphone-se-third-g...

I am guessing it has the same or very similar battery and that the battery life difference is primarily due to changes in the silicon.

5G could make battery life worse a bit, so disable it could improve more.