Issue 11 and Volume 93.

BATTERIES IN PARALLEL FAIL TO FUNCTION PROPERLY One Takes Over-Charge While Other is Undercharged SPECIFICATION for motor fire apparatus, recently issued by a fire prevention organization recommends two batteries for each piece of motor fire apparatus—one battery to serve the siren where an electric siren is to be used and the other to supply current for the electric systems of the fire apparatus. With such an arrangement, the batteries would have to be charged in parallel from the generator. As a matter of fact the battery companies, Willard. U.S.L., and Exide, have all advised that they will remove their guarantee from any battery if an attempt is made to charge in parallel. No two batteries have exactly the same internal resistance and as the battery is continued in use, the resistance changes. Any attempt to charge in parallel would mean that one battery would get practically all the charge and…

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