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I'm offering to expand this discussion into the realm of ebook readers that utilize both batteries and some kind of solar power configuration.
One was built with solar energy around 2013. We have wrist watches that also rely upon solar energy.
So why not both?
Going slightly outside the discussion here, has anybody noticed the reliance (preference?) of buttons - again! - on ebook readers after what I term the 'touch-screen craze'? We seem to be going in circles in some regard, which is personally fine by me since I truly love the buttons on my Kindle Oasis 3 (finally released from Customs when they reopened after 3 1/2 months due to Covid-19). I can see batteries making a comeback on ebook readers, especially if the technology undergoes a huge development.
Wouldn't it be great to have a battery the size of a wrist-watch controlling your ebook reader, one that can simply be replaced by taking out a nickel from your pocket and unscrewing the opening and popping in a new one?
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