According to a Baidu post, both the standard iPhone and the smaller Pro version are expected to introduce increases in battery sizes. The leak stipulates that the iPhone 14 could come with a 3,279mAh battery (up from the 3,227mAh capacity on last year’s model), while the iPhone 14 Pro could see a net increase of more than 100mAh (from 3,095mAh to 3,200mAh respectively).
This information has subsequently been covered by 9to5Mac in a dedicated article. Although the source of the leak is not regarded as particularly credible, it should be noted that Mark Gurman, perhaps the most renowned Apple analyst, has asserted in his Power On newsletter that the iPhone 14 Pro models (at least) should be getting bigger batteries. There is no mention of the battery sizes of the non-Pro iPhone 14 models on his part.
This is not the first leak that points to possible increases in the battery capacity of the iPhone 14 lineup. At any rate, even if the aforementioned numbers do not look massive per se, the iPhone in general does a better job of maximizing power efficiency than its Android counterparts. Hence, even a small increase, coupled with the A16 chipset, could translate into tangible improvement to battery life. With Apple, numbers are not everything.