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2-3v source of energy

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Maxc13

Maxc13

Structural
Joined
Jan 14, 2015
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3
Location
PL
Hi,
I'm looking for a 2-3v source of constant energy
Please tell me if there's a way to harvest it somehow using new energy harvesting technologies (except solar)
If not could you please advice me rechargeable batteries that would last for few years.


 
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?? Two D-cells in series? You calculate what your cumulative current demand will be, and buy the appropriate batteries?

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