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 recording the results of the first discharge test for P & R FA11 battery cells.
| Identifier | ExFiles\Box 61\1\ scan0025 | |
| Date | 18th March 1924 | |
| 1st Discharge P & R FA11 Cells 18-3-24 Average Amperes = 13.0 Hours = 17.75 Ampere Hours = 231. Voltage per cell after discharge = 1.85 excepting cell no 8 which was 1.5. Density before discharge 1220 Density after discharge 1176 Curve whilst on charge 19 - 3 - 24 | ||