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).
Performance of different car battery types and requesting a detailed comparison.
| Identifier | ExFiles\Box 1\7\ B001_X15 20 46 50 59-page224 | |
| Date | 25th June 1913 | |
| COPY. X50 X.50 X.664 X560 X607 C.J. from F.H.R. Copy sent to Na.{Mr Nadin} COPY. June 25th. 1913. FHR6/C25613. I have received Mr Ellis' reports that he does not consider the C.A.V. accumulators that we have had on the lighting plant on the car, very good, and I understand that we have found the Exide cells excellent so far, and I propose that we use these as standard for both lighting and for cars in which there is no lighting, for ignition purposes. With reference to the comparison between the Edison cells and the best lead accumulators, I have not yet quite got the concise information for which I asked. Taking the 12 volt lighting battery as a specimen, I want a careful comparison between the best lead cell and the Edison cell. I want the answer in the following words :- "Weight in lbs. per ampere hour actual, not rated capacity. Percentage of variation in the voltage at the end of the discharge just before the rapid falling off and the percentage, of variation in the rise at the end of the charge". The total fluctuation will be the addition of these two amounts, i.e. above and below the normal. I may be able to find the information for myself in the books, but it will take me a long time with doubtful | ||