The iPhone SE 4 is rumored to have a 3,279 mAh battery, the same as the iPhone 14[4][5]. The iPhone 14 Plus has a larger 4,325 mAh battery and lasted 11 hours and 57 minutes in battery testing while surfing the web over 5G[3][6]. The iPhone 14 lasted a solid but unspectacular 9 hours and 28 minutes in the same battery test[3].
The iPhone SE 4 is expected to launch with an upgraded chipset, which should improve battery life because newer Bionic chips tend to be more power efficient[5]. The iPhone SE 4 may feature Apple's first in-house 5G modem, which could also offer higher energy efficiency[5].
Citations:[1] https://www.tomsguide.com/phones/iphones/iphone-se-4-vs-iphone-14-which-low-cost-iphone-is-best
[2] https://www.macrumors.com/2023/12/06/iphone-se-4-reuse-iphone-14-battery/
[3] https://www.tomsguide.com/news/iphone-14-battery-life-results-heres-how-long-all-four-models-last
[4] https://www.phonearena.com/reviews/iphone-se-4-2025-vs-iphone-14_id6751
[5] https://www.phonearena.com/news/iphone-se-4-battery_id164279
[6] https://www.yahoo.com/tech/iphone-14-battery-life-results-040122462.html
[7] https://www.reddit.com/r/iphone/comments/1dq9bff/just_upgraded_from_an_iphone_se_2_to_an_iphone_14/
[8] https://www.gsmarena.com/apple_iphone_14_plus-review-2493p3.php
[9] https://www.yahoo.com/tech/iphone-se-4-vs-iphone-070140463.html