What stops us from producing portable batteries for handheld devices like phones or laptops that would allow us to use such devices for weeks or months continuously?

Question

What stops us from producing portable batteries for handheld devices like phones or laptops that would allow us to use such devices for weeks or months continuously?

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Answer 1

We can only make batteries of a certain quality, it’s an area of very active research to make better ones. At the moment, to power a typical smartphone for a week would need a battery many times bigger and heavier than the ones they currently have, and most people don’t want a phone that’s way bigger and heavier than the one they currently have just so the battery lasts a week.