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).
Chart recording a battery charge and discharge test with performance data.
| Identifier | ExFiles\Box 54\1\ Scan170 | |
| Date | 8th July 1927 | |
| 8-7-27 182 P&R RR11-3 75 a.h. 97 lbs Charged to modified characteristic of V = 16 - .15A for 10 hours. Average amperes = 6.39 Hours = 12.9 Ampere hours = 82.4 .850 1.80v | ||