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).
Specification for a 40/50 HP chassis lighting and starting battery in two 6-volt units.
| Identifier | ExFiles\Box 168b\3\ img016 | |
| Date | 22th August 1928 | |
| X7535 SPECIFICATION No. 303. OF R.R. 40/50 H.P. CHASSIS LIGHTING & STARTING BATTERY IN TWO 6-VOLT UNITS. (1) CAPACITY. The ampere hour discharge capacity (actual) of the battery at the 10 hour rate should be definitely not less than 65 on normal discharge after the usual preliminary treatment. (2) SHORT PERIOD OUTPUT & INTERNAL RESISTANCE. The battery in normal operation, and at a temperature of 18°C. should easily be capable of maintaining (as a normal performance when nearly or fully charged), a current in excess of 104 amperes through an invariable external resistance of .100 ohm for a period of 6 minutes. (3) CHARGING RATE. The design of the grids and separators should be such that the battery is capable of withstanding a charging rate of 12 amperes, when in a fully charged condition, without an unreasonable amount of deterioration of the positive plates. This item is important in connection with battery life. It is realised that provision for this entails some loss of electrical efficiency and weight efficiency. (4) MATERIAL OF CELL BOXES. The material of each of the one-piece three-compartment cell boxes shall be moulded material of the best possible quality, perfectly free from any mineral impurities having deleterious action on the electrolyte. (5) ATTACHMENTS FOR LIFTING. Each component half of the battery shall be constructed with convenient attachments for lifting and removing that half from the battery box which is of R.R. design and manufacture. Each half of the battery shall be provided with a moulded lid{A. J. Lidsey} with suitable securing attachments. (6) WEIGHT. The weight of the two halves of the battery taken | ||