Like I wrote in my last post I'm focusing on different kinds of batteries,especially the concrete and cement batteries.These past few days I've been making a few and have some results which are encouraging for future projects.I used some aluminium casing with copper coils and different kind of materials mixed with the cement:Borax,Magnesium Carbonate,baking soda and road salt.All gave about a 1.3 V result(I have yet to see if this changes later)and I don't know if these ingredients helped at all(making another battery without anything added later).
Also a battery cell made with a small copper vessel and Aluminium rod produced 1.4 V.
On the flip side though: 3 battery cells I made with pewter and tin pots produced 0.06 V and 0.6 V.
When I connected the good working cells to some of my magbot pendulums they started to swing quite happily,so that gave me some ideas for future pendulums(like a pendulum with an Aluminium surrounded cement base and (a) copper pipes as the frame work).
Also Joule Thief robots with cement bodies are a possibility.
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