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 life testing and condition analysis of P & R and Exide batteries following bench and road use.
| Identifier | ExFiles\Box 54\2\ Scan085 | |
| Date | 17th March 1926 | |
| 17.3.26. -2- JC.15. About one month after this both batteries were put on bench life test consisting of alternating overcharges and partial discharge; the P & R remaining in for 8 months and the Exide for 11 months. During this time low and high rate discharges were taken on the Exide with results similar to those obtained on the routine. After 8 months the P & R was put on chassis 93-NK and completed 28,476 miles in France satisfactorily in the short time of 3¼ months, when two cells failed by shorting. After 11 months on the bench life test the Exide was put on chassis 8-EX when it ran 15,545 miles in France satisfactorily in 7 months when two cells failed by shorting. The full age of the P & R battery was 13¼ months and that of the Exide 20 months. Condition of batteries on being opened up for examination. The cell to cell connections on the P & R were somewhat corroded but were quite tight and the electrical circuit O.K. The box was generally good. The cycle stay spokes were also good showing no sign of corrosion, being covered with the compound which had run down between the cells to protect them. The cell to cell connections on the Exide were good and clean, quite tight and the electrical circuit Contd. | ||