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I imagine you also need a large battery on a laptop to edit 4K image and video files without running out of battery power before you can finish saving a large 4K video files or many 4K image files.

4k displays/laptops would sap any battery or power source quickly, another drawback on them.

I heard of people carrying huge battery packs to charge their phones, and laptops, so I feel you may need to carry a lot of USB-C battery packs to charge a 4K laptop a few times.

It does take a few to keep things charged or keep a monitor running.

I saw a video of a suitcase with a big battery inside it which can charge a laptop and many devices at once. I think someday there would be more people who own huge batteries in suitcases if they need to use a laptop with a 4K monitor for a longer amount of time.

that sounds pretty awesome, I wouldn't mind having that.

There is also a suitcase where you can also ride it, and charge USB devices.