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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We do have those, they just weigh so much nobody wants to carry them. At this point it is more convenient to just charge every now and then. Some phones dedicated to travel/rural areas do include a bigger battery and/or reduce features like screensize or prozess power to increase battery life.
Take any battery that is in current electric cars and use those to charge a phone and you could go a pretty long time. You just would have to carry it everywhere. There are actually some that do this, basically use the cars battery (or a dedicated one) with a charging/usb port. Used to be able to drain the car dead, modern cars usually solve this by separating them.
Many other designs and solutions exist ofc, including powerbanks of varying size.
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