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).
Battery performance tests, comparing a standard battery with a Lucas battery under various conditions.
| Identifier | ExFiles\Box 164\2\ img047 | |
| Date | 20th May 1940 | |
| - 2 - Cont'd.{John DeLooze - Company Secretary} voltage at the end of 5 secs. is the measure of the battery's ability to start the engine. It is also an indication of the magnitude of the internal resistance. Normal temperature. Extreme cold. Standard = 9.02 volts. 7.32 volts. Lucas = 9.75 " 6.13 " 5. Starting Capacity Test. The object of this test was to ascertain the capacity of the battery, or, to what extent it could repeatedly start an engine before failing. This was measured by the number of minutes it could maintain a current of 100 amperes or more, when discharged on a certain constant resistance. The current at the commencement of the discharge, i.e. the maximum current, is also an indication in respect of the internal resistance, and should agree with the indication for normal temperature, in (4). Maximum Current. Time over 100 amperes. Standard = 107.3 amperes 7.0 minutes. Lucas = 110.9 " 13.4 " 6. Life Test. This test consisted of repeatedly discharging, and charging, the battery, at the rate of one cycle per day for 5 days per week, until it was worn out; the number of cycles being a measure of the life of the battery. The discharges were carried in series of 20 at the 7-hour rate, alternating with series of 5 at 240 amperes, approximately the 5-minute rate. Charging was at the normal rate and carried out during the night. - Continued -> | ||