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).
Battery test chart recording showing a discharge curve with calculated average amperes, hours, and ampere-hours.
| Identifier | ExFiles\Box 49\5\ Scan361 | |
| Date | 14th April 1924 | |
| 25 14-4-24 134 Exide 6BXRE5-FF 82.5 lbs 60 ah. Average amperes = 6.54 Hours = 9.33 Ampere hours = 61.0 .739 1.80v. RECORDING CHART No ME.C.C.E.RT | ||