While still in school, I restored the spent battery pocket receiver rather primitive, but effective way. With pliers gently removed the graphite rod and filled the battery with water. Then waited until the water completely evaporated, put back stem — and battery-some time worked better than new.
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At work and in everyday life there is often a need in galvanic power source with a stepped gradation of the EMF (including the symmetric polar voltage). Often this "standard" range:...
