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).
Test report on a 12-volt battery's discharge performance, construction, and comparison to standard models.
| Identifier | WestWitteringFiles\E\August1920\ Scan12 | |
| Date | 20th August 1920 | |
| R.R. 199 (250T) (SD676 19-7-17) MP 180865 Contd. -3- EFCl/T20.8.20. discharge, the time to attain this point was 14.9 hours, showing a capacity at this approximate rate of discharge, say 10.2, of 152 ampere-hours. The battery does not appear to stand out pre-eminently at any rate in capacity for weight, but is on much the same level with the better batteries made both over here and in America. It might be an advantage in some instances to divide the 12 volt battery into two parts, carrying one half each side of the rear of frame, but in this particular case, each half of the battery is as large as our standard and weighs rather more, so that this size of storage battery would be considerably larger than is necessary for the R.R. car. The first three (continuous low rate discharge) tests were taken with due regard to the size, their rate of discharge being increased accordingly, but it was not convenient to so proportion the rate od discharge in the latter two tests to the size of the battery. We know, however, that if this had been done the performance would not be better than our standard and possibly a little inferior. The plates of this battery are supposed to be of special construction enabling them to withstand a great deal of vibration. We do not, therefore, consider the above results as finally proving that the battery is no better than others, but it will be necessary to see how the battery behaves in respect to life tests. Our vibration rig for batteries is not yet ready but this particular battery will Contd | ||