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).
Comparison of various batteries, analyzing their performance characteristics and discharge curves.
| Identifier | WestWitteringFiles\L\2April1924-June1924\ Scan77 | |
| Date | 15th May 1924 | |
| Contd. -6- EFCl/T15.5.24. Battery. Weight (lbs) Motor amperes. Battery terminal volts. Speed observed on battery ignition distributor rotor. (R.P.M.) Fuller Sparta. 103.5 98.0 10.75 34.5 Lithanode. 92 96.0 10.55 34.5 P & R TBDll, or Exide 6BXE5. (Results nearly enough identical). 95 82 94.5 9.87 29 Ni-Fe. 122 94.5 10.15 29 Alklum 50. 81 91.0 9.05 27 " 60. 93.5 89.5 9.1 24.5 It will be noticed from the above that the order of cranking ability corresponds with the height of the high rate discharge curve in the initial stages. This only represents the relative initial activity of the various batteries after the full charge. This is not everything that has to be taken into account - there is no doubt that the falling off of cranking ability would correspond to the way in which the high rate discharge curves fall off with time. Another point to be noted is that the smaller Alklum was actually better on this test than the larger one. Apparently the battery was more nearly in the form indicated by the better of the two high rate discharge curves. Apart from those already mentioned, the principal difficulties in connection with alkaline cells are :- | ||