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If it uses so little power...

Is charging the battery using solar power, like an old-style pocket calculator, practical? Just embed a few tens of square centimeters of cells under plastic on the edge of the keyboard. As a bonus, that means you don't have to permit anybody to open the thing ever, which grants you the ability to make it waterproof.

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I've got a Logitech (non-folding) solar-powered keyboard. Happy to report it's been working for nearly a year now using that delicious sun energy.

Being a sceptic, I did also put it in a sock drawer for a few days after use to see if it would fail to charge. It failed to turn on after that until I'd left it in the sun for a while.

The thing about the low power being that the battery, still sizable, would last weeks/months even working in the dark in a cave at 0 lux, while indoor lightbulbs at 100-1,000 lux (desk usage) would provide enough energy to sustain a full charge without any deliberate charging activity in full sunlight at 10,000-100,000 lux.

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