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).
Test report on a P & R 3A battery (121).
| Identifier | WestWitteringFiles\Q\February1927-March1927\ 31 | |
| Date | 2nd February 1927 | |
| COPY JC.69. TESTS ON P & R 3A BATTERY (121). This battery was given a high rate discharge through a constant external resistance of .100 ohm. Initial amperes = 96 Time to 90" = 1.5 mins. " " 80" = 4.0 " This result is very poor and is due to the crack between the cell partition as reported in JC.51 15.11.26. The negative end cell was down first and shewed negative weakness on the Cadmium. Cracks have now started between all the cell partitions. Immediately after a full charge, a low rate discharge was taken through a constant external resistance of 2.34 ohms. and only gave 29.1 ampere hours. The same cell was again discharged first and shewed positive weakness. A further charge was given and the battery was allowed to stand for 3 days when it was again discharged as before, and only 13.6 ampere-hours were obtained. This shews that the crack is allowing current to pass between the two cells and therefore discharging them whilst standing. The approx. age of this battery is 39 months and it has given very good service, having run 21,751 miles and been in the E.M.S. for 12 months, and now the elements have outlasted the case before failure. The case is very badly distorted due to the swelling of the plates. DELIV'D DJS EFC/G.Johnson. | ||