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).
The policy for changing batteries on models, with a specific comment on the Wraith battery.
| Identifier | ExFiles\Box 151\3\ scan0362 | |
| Date | 4th February 1938 | |
| -2- Rm {William Robotham - Chief Engineer} /Wym. {G. Harold Whyman - Experimental Manager} 1/WH.4.2.38. In future, batteries should not be changed on any models until they have been proved satisfactory both on a car and on bench tests. The Wraith battery appears to have been an effort on someone's part to save weight and money irrespective of performance. Rm {William Robotham - Chief Engineer} /Wym. {G. Harold Whyman - Experimental Manager} | ||