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Hi there! A friend just mailed me this very fascinating link.

I simply cannot withhold this from any fellow camper/ hiker/ biker/ bush trader, whomever!

From scrap batteries to MagSafe power bank | bitlog :: uncovering secrets at the frontier of technology

Note this:
If the 1-wire is absent, the OK signal is omitted and charging circuit will not be activated, but any available DC power will always be used to power the MacBook.
In need of power & have some electronics insight? The DIY itch?
There you go, enjoy!

 
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