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).
Test report on the performance and condition of a two-year-old battery.
| Identifier | ExFiles\Box 168b\3\ img223 | |
| Date | 23th July 1929 | |
| B.H.G. X.7535R. 23-7-29 J.D.19. X.2535D Re Tests on PR2-6RR11-1 Battery (187) This battery is now 2 years old & and has ran 11,256 miles & has been on our bench life test 19 months. On low Rate discharge 54.8 ampere hours were obtained & all cells shewed positive weakness. After being given a full charge a High Rate Discharge was taken Initial amperes = 109.0 Time to 104 " = 10.9 min " " 100 " = 16.3 " " " 96 " = 20.0 " All cells shewed negative weakness. E.H. | ||