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).
Instructions on battery maintenance, density readings, and in-garage charging procedures.
| Identifier | ExFiles\Box 26\2\ Scan063 | |
| Date | 26th April 1917 | |
| -22e- Contd. faulty more quickly than the rest if proper care be taken of the battery. If the battery is in ordinarily good working order, and care is taken to keep the densities, when in a fully charged condition, round about 1225, as already described, the state of charge of the battery will be very well indicated by density readings taken with the syringe type hydrometer. If the readings are 1175, the battery may be considered in/half a discharged condition. If the readings are down to 1125, the battery must be considered in a discharged condition. Charging in Garage. If there is a supply of direct current (for lighting purposes etc.) available where the car is housed, it is possible to charge the battery in position on the car without running the engine. For this purpose there is necessary a plug to fit the socket on the Lucas board, which plug can be obtained from Messrs. Lucas. The two terminals of the socket are in direct connection with the battery, therefore, if the plug be placed in series with a circuit through which lamps are supplied, or merely used as resistances, current for these lamps may be made to pass through the battery. Proper steps should, of course, be taken to ensure that the current is passing through the battery in the charging direction. This can be ascertained by reversing the plug in the socket. In the charging position the lights will be less brightly lighted than normally or than in the wrong position. Contd. R.R. 235A (500 T) (S.D.) 40B. 26-4-17) Bm. 2/156/13. | ||