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).
Comparison of battery test results for Dagenite, Exide, and Lucas models.
| Identifier | ExFiles\Box 164\3\ img194 | |
| Date | 5th July 1938 | |
| -2- Rm {William Robotham - Chief Engineer} /RC. {R. Childs} 13/JH. 5th July, 1938. Battery Test Results. Dagenite Dagenite Exide. Lucas. Rated capacity 6HZD11.S. 6HZD11.G. 6XCKR11.SL. 12TXW11. 10 hour rate. 61.A.H. 61 A.H. 64.A.H. 63 A.H. (1) Weight without lid {A. J. Lidsey} and bolts. 68.5 lb. 68.5 lb. 69.5 lb. 72.5 lb. (2) Dimensions without lid. {A. J. Lidsey} 13.9/16 x 6 7/8 x 8 5/8 13.9/16x6 7/8x8 5/8 13.9/16x6 7/8x8 5/8 14x6 7/8x8 5/8 (3) Starting ability (a) 7.68 volts 8.38 volts 7.45 volts 8.63 volts. (b) 9.52 " 9.71 " 9.25 " 9.92 " (4) Max current 111.0 amp. 110.5 amp. 108.8 amp. 111.0 amp. Time over 100 amp 14.2 min 14.25 min. 13.6 min. 13.7 min. (5) Life test. Not taken. Not taken. Not taken. Not taken. As regards the life test of batteries we agree with the points expressed in your letter, we ourselves had little confidence in the late method of testing. When we mentioned an extensive life test we did not mean anything quite so concentrated, but at the same time something more precise, and of shorter duration than a life test on a car. Our present ideas on this subject may be summed up as follows. | ||