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 results for a 3-year-old P&R RR11-3 battery detailing its low and high-rate discharge performance.
| Identifier | ExFiles\Box 54\1\ Scan161 | |
| Date | 30th September 1929 | |
| E.J.C. J.D.30. X4617 P. 30-9-29. X4617P. Re Tests on P&R RR11-3 Battery (1&2) This battery is now 3 years old & has been on our bench life test 34 months & has also ran 3,977 miles on the road. On Low Rate Discharge through a constant external resistance of 1.80 ω 85.7 ampere hours were obtained, all cells showing positive weakness. On High Rate Discharge Initial amperes = 112.0 Time to 104 " = 20.0 min. All cells showing negative weakness These results are excellent considering the battery so old as 3 years. G.J. | ||