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 P&RTBD7E-15 battery detailing low and high rate discharge performance.
| Identifier | ExFiles\Box 58\3\ Scan190 | |
| Date | 24th February 1931 | |
| E.J.C. T.D.120. X4642P. 24-2-31 X4642P Tests on P&RTBD7E-15 Battery (194) This battery has ran 12,594 miles on 16 G IV & is 2 yrs 7 months old. On Low Rate Discharge 57 1/4 ampere hours were realised all cells showing positive weakness. On High Rate Discharge Initial amperes = 102 Time to 100 amperes = 2.0 min " " 90 " = 11.6 " " " 80 " = 14.0 " All cells showed negative weakness on the cadmium. g.j. | ||