Great Story. We just bought a battery recharger for the 9 volt batteries the Beck blood cleaner uses, and the Colloidal Silver maker we use seperately for making Colloidal Silver , the BT6 pro, etc. I know many areas of the world have no electricity or very problematic electricity - plus anything less than using metal hydride rechargeable batteries is quite an expense if you are using zappers or other devices that rely on batteries.
Page 590 that you mention... great reminder and advice.