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You'd need multiple units for a decent phone or tablet My experience is that a power bank might take nearly a week at times to recharge completely. Maybe one might do for a 6″ eink, charging from when you go to sleep and on the windowsill. I have some 3m long USB cables.
Devices vary hugely in power consumption (6" or less eink with 800 x 600 dpi & slow single core vs 10" HD tablet using Mobile, Wifi, BT and light up high watching video).
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