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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).
Letter to Messrs. Peto & Radford regarding a faulty 12 volt BDT battery with a suspected short circuit.

Identifier  ExFiles\Box 38\5\  Scan295
Date  22th December 1922
  
X.3398.

EFCL/T.

22nd. December, 1922.

Messrs. Peto & Radford,
50, Grosvenor Gardens,
London, S.W.1.

Dear Sirs,

Re BDT. Battery.

Answering your M/C.1912 of the 19th inst., with reference to the 12 volt BDT battery returned, it appears that the washing out has removed the deposited active material which must have been causing the cells to be partially short circuited, as certainly the most we could obtain from the battery before returning it to you was 47 ampere-hours immediately after a 200 amperes hour charge, and it would not give anything like this capacity if left standing any time.

We note you say that there is one cell still pulling the battery down and your wording rather leads one to suppose that one cell being faulty can affect the others. Is there any reason whatever of such a phenomenon being possible?

We would like you now to open up the battery as you suggest and give us a report on what you find.

Yours faithfully,

FOR ROLLS-ROYCE LIMITED.
  
  


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