(image via: notes from knut)
Battery chargers prevent a lot of waste, but they still consume dirty energy. Wouldn’t it be nice if we could just put batteries out in the sun? Well, if this design from Knut Karlsen ever goes to production, we’ll be able to do just that. SunCats are regular old batteries wrapped in flexible photovoltaic cells, wired using a conductive silver pen and some flat wires salvaged from a broken camera lens. The second version will have built-in capacitors to make the batteries more powerful.
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