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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).
Comparison of charging voltages for P&R and Exide batteries under varying temperature conditions.

Identifier  ExFiles\Box 168b\3\  img074
Date  30th September 1930
  
E.F.L X7535 30-9-30
JD{J. Draper - Frames}97. X7535

Charging Voltages.

The latest information re charging voltages on our std 41/50 batteries is as follows.
The voltage of the P&R is still slightly higher than the Exide by about 0.2 volt per 12 volt battery.
It is also notable that at a normal temperature of 50°F the P.D. of the Exide rises quicker than the P&R with increased charging current resulting in a similar voltage being sustained on both batteries, whilst at a high temp: of 100-115°F the P&R rises the quicker & results in a higher voltage than on the Exide.
Curves showing these results are attached.

G.J.
  
  


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