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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 on the charging potential difference of P&R and Exide standard 6-volt unit batteries.

Identifier  ExFiles\Box 168b\3\  img029
Date  20th January 1930
  
JD{J. Draper - Frames}49 X7535 20-1-30

676. X7535

Charging P.D's on P&R & Exide Std 6 volt unit Batteries.

Tests have been made on the New Std P&R & Exide 6 volt unit batteries having the improved modifications as outlined in JD{J. Draper - Frames}48 3-1-30.

The batteries were put in a tank filled with water which was artificially heated to any required temperature. The battery was then connected in series with a charging circuit.
The charging P.D's were taken at various rates of charge at any temperature which could be fixed & the readings plotted on a graph.
It will be seen that the PD is higher on the P&R than on the Exide.

g.f.
  
  


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