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WWII Walkie talkies were big because the batteries were useless.
Back in the eighties the mobile phone was in a box the size of a lunchbox. Once again because the batteries were poor -
I have a Lithium Ion powered drill - it can drive batten screws into dry hardwood.
Paint on solar cells are a reality.
So why haven't we got lithium ion powered cars painted with solar cells?
Profit - work for mechanics ....
Note how Kodak are now going belly up
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