No wonder Apple claims SE3 has better battery life!
SE3 has a 7.82 Whr battery, compared to SE2 6.96 Whr. These numbers come from Apple's legal compliance documents updated on 3/10.
It'll be really interesting to see how Apple has managed to squeeze a larger batter inside the chassis. The Taptic Engine is very likely smaller (same as iPhone 13). It's also likely Apple removed some antennas as SE3 no longer supports gigabit LTE.
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why on earth would the 2022 iPhone SE not support gigabit LTE? I’m not seeing the full spec sheet on their page but I think this you have in error.