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).
Performance tests on various battery types, measuring charging and discharging characteristics.
| Identifier | WestWitteringFiles\Q\December1926-January1927\ 93 | |
| Date | 1st January 1927 guessed | |
| -2- Contd. On discharge the battery now gave 65.3 ampere-hours. The second was a case of a standard Exide battery with the exception of having threaded rubber separators (one of our experimental batteries). First this was charged at a continuous current of 6 amperes, and the maximum sustained P.D. was 15.4. Discharged through the constant external resistance of 1.80 ohms, 58.1 ampere-hours were obtained. On charging to the characteristic, the maximum sustained P.D. was 15.2 and the final charging current 6½ amperes, these remaining constant for three hours. On discharge 51.6 ampere-hours were obtained. It was again charged to the characteristic and discharged, when 50.4 ampere-hours were obtained. The battery was then charged with a constant current of 6 amperes; when on discharge it gave 56.3 ampere-hours. It was noticed that one cell was weaker than the others and this may account for in this instance for the difference between the two methods of charging. The next test was on one of our sandwich batteries of standard exide and P & R cells. On charging this battery with a constant current, of 6 amperes, the highest sustained P.D. was 15.5, and the lowest high rate discharge obtained through an invariable external resistance of 1.80 ohms, was 54.7 ampere-hours. Contd. | ||