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).
Graphed record of a battery performance test, showing discharge characteristics.
| Identifier | ExFiles\Box 54\1\ Scan172 | |
| Date | 13th July 1927 | |
| 13-7-27 182 P&R RR11-3 75 a.h. 97 lbs. charged to modified characteristic of V=1.6 - 6.5A for 19 hours. Average amperes = 6.41 Hours = 13.1 Ampere Hours = 87.0 .866 1.80w | ||