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).
Letter to Lucas Ltd. detailing the results of a starting capability test on their STXR9A battery compared to an Exide battery.
| Identifier | ExFiles\Box 164\3\ img183 | |
| Date | 11th June 1938 | |
| EXPERIMENTAL DEPARTMENT. Rm {William Robotham - Chief Engineer} /RC. {R. Childs} 11/JH. 11th June, 1938. 6021 Messrs. Lucas Ltd., Great King Street, BIRMINGHAM.19. For the attention of Mr. Toulmin. Dear Sirs, We have completed a test on the Lucas STXR9A battery which you submitted for test July 1937. In order to ascertain the suitability of any battery for use on our cars we have evolved the following schedule of test. (1) Starting capability. (2) High Rate discharge. (3) Life test. (a) On the bench. (b) On the car. We consider that the starting capability of a battery is of first importance and that it must be satisfactory in this respect to justify further consideration. Test (1) consists of discharging the battery at 280 amperes for 5 seconds, the terminal voltage at the end of this period giving a measure of the speed at which the engine will be turned under extreme cold conditions, also of the available voltage for the ignition circuit at starting. In respect to test (1) the Lucas STXR9A battery is inferior to the Exide 6mXR9, and as recent tests have proved Cont'd. {John DeLooze - Company Secretary} | ||