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).
Leakage of charge test conducted on a standard 12-volt battery over a three-month period.
| Identifier | WestWitteringFiles\F\January1921\ Scan35 | |
| Date | 24th January 1921 | |
| To R.{Sir Henry Royce} from EFC, c. to CJ. c. to E.{Mr Elliott - Chief Engineer} c. to By.{R.W. Bailey - Chief Engineer} c. to Da.{Bernard Day - Chassis Design} c. to EP.{G. Eric Platford - Chief Quality Engineer} c. to PN.{Mr Northey} c. to EWT. for R.R.Inc. ORIGINAL X.3980 - LEAKAGE OF CHARGE TEST OF STANDARD X604 CHLORIDE 6 BXE 5 12 VOLT BATTERY. For the purpose of the above test a standard battery was fully charged and the last two cells Nos. 5 and 6 from the positive end were removed, the other four being allowed to stand linked together. The battery was allowed to stand for three months without being charged or discharged, the two cells standing separately. At the end of the three months, the two cells were replaced and the battery discharged. As each cell dropped to 1.75 volts it was removed from the battery and the discharge continued. The ampere hour capacities obtained from the various cells were as follows, the discharge having been carried out in two periods separated by a night interval :- the first period comprising 40 amp.hours. Cell No. Ampere-hours. -1 40.0 2 59.5 3 48.0 4 54.0 5 52.5 +6 66.5 (1st period only) It will be noticed in a general way that the cells which stood separately retained a greater charge. It would appear, however, that a longer time than three months is necessary for this test. Contd. | ||