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).
The failure of two P & R battery cells, detailing mileage, age, and condition upon dismantling.
| Identifier | ExFiles\Box 54\1\ Scan323 | |
| Date | 16th January 1929 | |
| EFC. JC.148. 16.1.29 FAILURE OF CELL IN S1 BATTERY (154) A P & R cell has failed in this battery after having run 18,840 miles and has been on our bench life test 21 months. The age of this cell is 3 years 7 months. On dismantling this cell it was found that the negative plates were very good and the separators also good. The positive plates were fairly good. The grids were very weak but little paste had fallen. Failure was due to stretching of the positive plates and shorting on the negative bus bar. JC.149 FAILURE OF P & R CELL IN S3 BATTERY. A P & R cell has failed in this battery after having run 32,821 miles. The condition of this cell and its cause is as stated for the cell in report JC.148. of the above date. The only difference is that the positive plates are better in having lost very little paste, there being so little deposit for the amount of running it has done. I estimate that if the positive plates had not stretched and shorted the cells referred to in these two reports they would have given a longer life by about 18 months to 2 years. EFC/G.Johnson. | ||