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).
Graph of sustained potential difference versus current for a P&R R.R11-3 battery during charging.
| Identifier | ExFiles\Box 62\3\ scan0095 | |
| Date | 3rd January 1931 guessed | |
| VOLTS. SUSTAINED P.D ON A STANDARD P & R.{Sir Henry Royce} R.R11-3 BATTERY CHARGING AT VARIOUS CURRENTS. WITH THE BATTERY IN A FULLY CHARGED CONDITION AMPERES. | ||