Still working on the cement,and other,types of batteries,after a two week holiday in the US.Of course I visited the American Science and Surplus store in Chicago again and got a few things.
Even though a cement battery was able to power my Magbot pendulum it didn't last very long.After about 50 hrs non-stop swinging the pendulum was barely moving,so that is not really useful.
And the water based batteries don't seem to work now either,I guess more testing is needed.
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