The iPhone 13 will have improved battery tech, according to a top Apple analyst

The four iPhone 12 handsets are excellent smartphones, but there’s one issue across the board: battery life. In our iPhone 12 battery test, we found that both the regular and Pro models suffered compared to the iPhone 11, and the effect is especially pronounced when playing 3D games.
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https://www.tomsguide.com/news/iphone-13-leak-just-revealed-a-surprise-upgrade