Rolls-Royce Archives
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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).
Battery efficiency tests concluding a 70% figure is correct based on replacement charge data.

Identifier  WestWitteringFiles\H\January1922\  Scan47
Date  1st January 1922
  
Contd.
-3-
EFC/132.1.22.

That this efficiency figure is approximately correct was confirmed by a preliminary test in which an efficiency of 70% was assumed, so that after each high rate discharge 43% more ampere-minutes were replaced than were taken out, and we have found that in these circumstances the battery appeared to keep reasonably fully charged, after each replacement charge.

EFC.
  
  


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