Transactions of the Society of Motion Picture Engineers (1929)

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460 Transactions of SM.P.E., Vol. XIII, No. 38, 1929 more output than a present type of batter}^ that is designed for an all-around service. However, the cost of putting in a new mix and making the battery nonstandard is more than w^ould be justified from any possible market outlet at the present time. It is possible to favor one characteristic at the expense of others but the gain is very often too costly, either in quality or in actual cost in the manufacture. The high voltage batteries will not have a better shelf-life than the standard batteries. The voltages that are made will depend upon what the industry will require. At present they rrui 108 and 144 volts. Dr. Rosenberger : I should like to know the average shelf -life of a B-battery of 45 volts. Mr. Schulte: The average shelf -life of a ''B" battery of 45 volts, is from six months for the two smaller sizes to a year and a year and one-half for the larger sizes. Mr. Ross : Is the shelf -life also proportional to the humidity in the air and the temperature of storage, and is it possible to revive a large capacity battery (I am referring to a single cell such as the house cell) by drilling through the seal at the top and adding a solution. If so, what should the solution be ? Mr. Schulte : High humiditj^ and high temperatures decrease the shelf -life of a battery but I have not seen any data that would indicate that it was directly proportional. It is possible to decrease the resistance of a used battery and obtain a fractional part of additional energy by adding an electrolyte to the battery. The energy obtained however is very small and there is no recharging effect. It is merely a wetting on the inside and a consequent decreasing of resistance. A possible liquid would be similar to the batterv electrolvte which is a salammoniac solution.