There simply haven’t been very many advances in battery technology, at least relative to everything else.
So there are only two ways to make a phone’s battery last longer: make the phone take less power or make the battery physically larger.
More energy efficiency, and thus a lower power requirement, is possible to a point and we have been doing that. But really extreme decreases in the power requirements of a phone mean it’s less powerful. We are taking a slower phone with fewer features and a smaller screen.
And a larger physical batter means a larger and heavier phone
Neither of these are things that consumers want.
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