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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).
Capacity and weight differences between old and new starter batteries.

Identifier  ExFiles\Box 38\5\  Scan367
Date  25th August 1927
  
BY/C.
X30982
To BY/HEB.{H. Biraben} from EFC.
EFC6/T25.8.27.

With reference to the attached P.C. from customer, the type of starter battery referred to by him is the old type in the teak case with teak lid{A. J. Lidsey} for bolting direct to the foot-board of the chassis without utilising the RR. box. The weight of such a battery complete, including lid{A. J. Lidsey}, was 95 lbs. The weight of our present battery, which is rated by Messrs. P & R and agreed to by us as being of 80 ampere-hour capacity, is 105 lbs.

We were never able to obtain more than 60 ampere-hours capacity from the old type of battery, and I suppose, though I cannot now remember definitely, that we told P & R.{Sir Henry Royce} that they had rated the battery too high on the basis of "actual capacity". After all, it is illogical to rate a battery weighing 93 lbs. (without lid{A. J. Lidsey}) at the same figure as one weighing 105 lbs. An extra 12 lbs. of elements and electrolyte makes a good deal of difference. Messrs. P & R's contention that the battery is "actually" of 80 ampere-hours capacity is, we say, incorrect. The fact that they agreed to label this 60 ampere-hours in any case, would show that the Technical Dept. at any rate agree to our contention.

One of the reasons for the newer and larger battery was that it had increased capacity. EFC.
  
  


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