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 P&R cells in 40/50 type Sandwich and 20 HP batteries, including life test results.
| Identifier | ExFiles\Box 54\2\ Scan126 | |
| Date | 5th July 1928 guessed | |
| -2- Contd. Failure of P & R cells in our 40/50 type Sandwich Batteries and in P & R. {Sir Henry Royce} 20 H.P. Battery. A number of references have been made to the former in previous correspondence. In this connection may we refer you to ours EFC {E. Fowler Clarke - Electrical Engineer} 1/T of 4.10.27 and your answer M {Mr Moon / Mr Moore} /5, 17.10.27, in which you have suggested that we might return to the subject (i.e. of further modifications to P & R cells subsequent to those supplied for the sandwich batteries) when the present cells failed. My assistant now reports to me two cases of P & R. {Sir Henry Royce} cell failure in these batteries. A copy of his report (JC.109) is attached. A concise data history of each of these two batteries is as follows :- Cell from SY. Battery. Started in service 23.11.25; fitted with two P & R. {Sir Henry Royce} cells, 2 Exide cells, one Oldham and one Fuller. Bench tests were taken and gave fair results. The battery was then fitted to chassis and ran 9012 miles on the road in approx. six months, after which the battery was again tested, and similar results were obtained as when new. Following this, the battery was put on our bench life test for two years (which means overcharging at normal rate interspersed by two discharges per week), at the end of which time one P & R. {Sir Henry Royce} cell failed, as reported in JC.109, of 27.6.28. The battery can be considered to have done an amount of work equal to 30000 miles on the road. Cell from SL Battery. Started service 11.6.25 fitted with three P & R and three Exide cells. Put through our bench tests and gave fair results. The battery was next put on our bench life test where it remained for 20 months. Bench tests were again made and very fair results were obtained. Following this the battery ran 18,206 miles on the road when one P & R. {Sir Henry Royce} cell failed. The battery can be considered to have done an amount of work equal to 35,000 miles on the road. Contd. | ||