Why can’t a single portable battery work with all of devices (laptop, phone, camera, etc

Question

Why does every product have a list of devices it can work with and cant?

In: Engineering

Answer 1

Well you could use thus : https://smile.amazon.com/gp/product/B07CYMCLDN/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

that would let you plug in almost any device you want.

But more specifically, all devices need different voltages, so they need different inputs to function. Also, devises use different amounts of power, would you want a laptop that only lasts 4 minutes, or a sell phone the size of a fanny pack? There are some closer to universal battery types/sizes which are then adapted to fit their use, like the 18650 cell which is individually quite small and is used quite extensively in larger applications (like Tesla cars). They stack up huge amounts of them very specifically to increase both the voltage and the capacity.