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I remember a computer magazine maybe 25 years ago with a cartoon "New lightweight laptop with longer battery life".
There was a wheeled shopping bag/trolley with the battery.
I actually have such a thing that converts to a backpack with a 25 Ah 13V LiFePO4 battery in a box with mains charger and solar charger (MPPT). A long whip aerial can be clamped on the telescopic handle. I have also a couple of 12V (nominal) to USB-C 2A converters so I can charge gadgets from it. There are optionally two large solar panels that can fit in the back of the car.
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