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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).
Test report comparing the performance of various batteries under different loads.

Identifier  WestWitteringFiles\C\May1919\  Scan39
Date  26th April 1917
  
Contd.
-4-
EFC1/T2.5.19.

Battery. | Current switched on. | Steady terminal voltage when current attained a steady value. | Instantaneous voltage reading when current was broken. | Difference of voltes. | Battery resistance.
------------------------------------------------------------------------------------------------------------------------------------------------------------------
Lucas 60 amp. hr. celluloid. | 101 amps. | 11.34 | 12.21 | .87 | .0086
C.A.V. 60 amp. hr. celluloid. | 101 | 11.23 | 12.33 | 1.10 | .0109
P.& R.{Sir Henry Royce} 60 amp. hr. celluloid. | 96 | 10.73 | 12.04 | 1.31 | .01365
Chloride 60 amp. hr. ebonite. | 97 | 10.92 | 12.21 | 1.29 | .0133
P.& R.{Sir Henry Royce} 45 amp. hr. ebonite. | 96 | 10.87 | 12.16 | 1.29 | .0134
Fuller. | 88.6 | 9.87 | 11.50 | 1.63 | .0184
Tudor 60 amp. hr. ebonite. | 84 | 9.46 | 12.09 | 2.63 | .031
Tudor 60 amp. hr. celluloid. | 82 | 9.23 | 12.16 | 2.93 | .036
Tudor 45 ampere hr. ebonite. | 75 | 8.44= | 11.97 | 3.53 | .047
Set of 6 M.A.2 Exides. | 83.5 | 9.36 | 11.99 | 2.63 | .0315

The actual resistances of the various batteries, when carrying heavy currents such as are drawn by the starter motor, we think are fairly well determined in the above way. We have found, however, that the resistance does not appear to be the same for different strengths of current, being considerably higher for smaller currents than for larger ones. The illustrate this

Contd.

R.R. 235A (500 T) (S.D. 408. 26-4-17.) Bm 2/156/13.
  
  


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