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 regarding the fitting of two 2 volt 40 ampere hour Crompton cells to a Packard car and the associated cost.
| Identifier | ExFiles\Box 127\1\ scan0027 | |
| Date | 21th January 1913 | |
| X435 W. to S. 21-1-13 TBB9/L21113 Re Packard Car. With reference to the Packard car which was despatched to you on January 15th, will you please note that there were two 2 volt 40 ampere hour Crompton cells fitted to same, and we are charging you with 90% of the cost price for these. | ||