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 from Alklum Storage Batteries Limited providing technical specifications for a 12-volt, 60-ampere-hour battery.
| Identifier | ExFiles\Box 164\4\ img127 | |
| Date | 21th October 1933 | |
| COPY OF LETTER dated 21.10.33 From: ALKLUM STORAGE BATTERIES LIMITED ALKLUM BATTERIES We regret that we have been unable to put forward figures due to unforeseen circumstances, as promised by our Mr. Berg during his visit. We have pleasure in submitting the following particulars of a battery of our type which we feel confident would do everything that would be required from the same with a Rolls Royce Engine. ONE - 12 volt, 60 ampere-hour ALKLUM battery consisting of 5 double cells, 2 1/2 volt each, fitted in wood crate in a single row. The battery would be plated throughout and fitted into either a polished or black crate. Normal charge current......8 amps at 10 hour rate. Minimum ..... 3 amps for extended length of time. Maximum .... 40 amps for half hour. Discharge Current ..... 6 amps at the 10 hour rate. Maximum ..............180 amps. [handwritten: 300] Final Charge voltage .....16.2 Average Discharge voltage 12.2 Internal resistance ..... 0.002 Ohms per cell. With regard to the internal resistance, we take this opportunity of saying that if tests should be required we can carry out the same here and supply you with figures and the method of obtaining the internal resistance when you could satisfy yourselves as to the figures we put forward. With regard to the maximum discharge current, we draw your attention to the position with our batteries, that they can be dead short circuited without the slightest fear of injury. The battery we are putting forward would have extremely thin plates and have a maximum plate area which is a considerable improvement on all the old type of Alkaline batteries, and this particular type of plate is used for starting the heaviest oil engines for bus work. (Continued) [Handwritten notes in the right margin:] 165 125 100 2.5 3.7 4.6 ask. | ||