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 from Peto & Radford discussing the suitability of various battery models for different horsepower cars.
| Identifier | ExFiles\Box 38\5\ Scan201 | |
| Date | 8th February 1922 guessed | |
| -2- Contd. If you can possibly find room for one of these assemblies we would urge you to allow it, because we are convinced that the B.D.7 is too small and that troubles would in some cases arise from the use of so small a battery. The B.D.7 is the size we supply to many of the 11.9 h.p. car manufactures and in our opinion it is not big enough for a 20 H.P. car. The writer put one on his 40/50 to observe its general behaviour. It is all right in a way, it does the job, will start it from dead cold etc. but there is no margin in it. In other words it is not a real Rolls-Royce job and in inexperienced hands on a car having a lot of town work, standing about with the lights on etc. a battery of this size would probably be found to be too small. More capacity can be got into the space allowed by using the N.D.E.9 or American type, but this means the very thin plates crammed together with insufficient acid space and in our opinion a step backward not forward and to be avoided if possible. We hope you will pardon our writing at such length on the matter, but we feel that for everybody's sake we should draw your attention to our views and that it is better to raise them now rather than later on. Yours faithfully, PETO & RADFORD. (sgd) C.R.W.Minchin. | ||