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).
Letter discussing the comparative performance of battery cells, mentioning tests on separators, plates, and leakage.
| Identifier | ExFiles\Box 35\4\ scan 192 | |
| Date | 20th September 1926 guessed | |
| EFC1/T -2- Contd. separators must necessarily be capable in the early days of its life of a better performance in certain directions. We did test a cell but found the positive plates to buckle so badly as to render the cell useless in a comparatively short while. Also the leakage across the top of the container was such that it would not stand comparison with one of your cells after standing charged side by side for a week and then taking a capacity test. Whereas your cell gave practically the full capacity, the Tungstone cell was down to two-thirds of what it would give immediately after charge. Of course really it is hardly necessary to tell you this because you probably know. The whole manner in which they have conducted their campaign seems to me to condemn their batteries. Of what practical value for instance are the wonderful ampere-hour efficiency tests which they have recently advertised. I should imagine a set of your plates shew quite similar results. if placed in the electrolyte without separators - or even with. When you say you have found that their lead grids do contain antimony, are you referring to the outer grid or the inner grids? Yours truly, | ||