Powering your device from small batteries or solar power

Hello,From time to time, we get emails about using a small battery pack, perhaps about the size of an deck of cards to power their Macbooks.  We also get similar emails about using solar panels about size of greeting card to power their Macbooks as well.I'd like to address this and the power industry as a whole.  Let me make it plain and simple.It takes a lot to make power.  There is
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