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I've 4 power banks (don't ask) and never found the need to use them with an ereader or phone. I guess I've never gone camping since getting them. I recently got a couple of USB to 9V/12V adaptors and now use them for a a couple of gadgets with no built-in batteries where the weight doesn’t matter. In the past I'd have fitted a load of NiMH cells, but I have the unused power banks bought for phone/ereader.
It's easy to add wireless charging to many things, but a gimmick.
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