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).
Battery performance tests, including discharge capacity, pricing, and weight comparisons.
| Identifier | WestWitteringFiles\F\April1921\ Scan62 | |
| Date | 1st April 1921 | |
| Contd. -2- EFC2/T6.4.21. can be made in the material with the finger, we find this not to occur. 10. As regards actual tests, this battery is being put through our usual routine tests and up to the present has completed three low rate discharges, the first one of which is merely a preliminary. The ampere-hour capacity on the second discharge at 7.0 amperes ( this being 1/10 of the rated ampere-hour capacity) we find to be 50. N.B. If the battery had been rated at 60 ampere hours it would have been discharged at 6 amperes and would probably have given about 55 ampere-hours at this lower rate. The third discharge at 11.6 amperes was much more satisfactory, indicating that the condition of the battery is improved with discharges. The ampere-hours realised on this third discharge were 55. The density variations in the acid are similar to those of any ordinary ebonite battery, such as our standard. High rate discharge capacity tests of this battery are about to be carried out, which will be followed by tests on the vibration test rig. The battery is going through these tests concurrently with several other new experimental batteries, e.g. Tudor, Exide (special), U.S.A. Exide and C.A.V.Willard. The quantity price of this battery is £8.-14-7 less 2% - £8.11.1 and the weight is 76½ lbs with acid. The cost of our present standard is £8.10.0 and weight 82½ lbs. EFC. R R 285A (50 T) (S.H. 986. 19-2-21) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 3008 | ||