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From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Providing instructions on battery maintenance, care, and diagnosing cell failures.

Identifier  ExFiles\Box 26\2\  Scan365
Date  14th June 1920 guessed
  
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short circuit any terminals of the cells.

Do not inspect the battery with the aid of a naked light, and on no account disconnect any of the battery terminals or connections when any charge or discharge current is passing, for such a course incurs a risk of an explosion, destructive to one or more cells, and involving personal risk.

A useful adjunct in connection with keeping the top of the battery free from acid is a small sponge, which should be used in conjunction with a bowl of clean water to remove acid from the top of the battery. Water wetness, unlike acid wetness, is non-corrosive and will quickly dry.

See that vent-plug passages are kept clear.

A battery should not normally be allowed to continue discharging when the voltage of any cell has fallen below 1.8 (except momentarily for the purpose of tracing a faulty cell, as described below).

It is most important that the battery should not be allowed to stand with its terminal voltage below 10.8, as this will shorten its life.

It is of even greater importance to keep all plates always well covered with electrolyte.

(This matter is taken from the present Chapter IV. Care of battery, but dealing with the battery as a unit in itself we say it should be included in your pamphlet.)

(17) Failure of one or more cells.

"If, when the battery is supplying current, its voltage becomes prematurely low, it may be due to one or more cells having become faulty.

This condition is best ascertained by the use of a small voltmeter, with which each cell should be tested independently, whilst the head lamps are lighted, and the faulty cell or cells located.

Ordinarily, it may be expected that all six cells will work together in much the same condition.
  
  


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