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).
Experimental testing and modifications of Exide and P & R car batteries.
| Identifier | WestWitteringFiles\U\May1930-July1930\ Scan140 | |
| Date | 9th July 1930 | |
| EFC9/AD9.7.30 contd. -4- Both makers have been continually pressing us as to the advantage but have not convinced us of the advantage. There was however, no objection to making an experimental test of this feature since a number of batteries are required from time to time for experimental cars. These two 6-volt units, one Exide and one P & R contained all the recently standardised and further proposed modifications as referred to above completely up to date. Reduction of Charging voltage on P & R batteries. We have recently received a proposal from the P & R Co; that they can, by certain modifications, reduce the charging voltage of their batteries still further than they have previously done and they have asked myself to discuss this matter with them at a time they will fix during the next few weeks. This is a desirable modification as the charging voltage of the P & R is at present higher than the Exide which means more heating of the generator when otherwise set to the same ampere output. It will be understood that the various modifications we have referred to arise from observations of the conditions of cells (upon opening up) which have ultimately failed in experimental test batteries, part of whose life consists of running on experimental cars with occasional testing from time to time in the laboratory. EFC. | ||