A Self-Contained “67.5 volt B Battery” for Portables
This article describes the construction of an AA battery powered 67 1/2 volt “battery”. This new rechargeable “B battery” is slightly smaller than the original Eveready 467 battery and is the same weight. The substitute battery can be made in different voltages and can be powered from a wide variety of sources.
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Read more Source:
http://www.portabletubes.co.uk/sitefiles/ausbatt.htm
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