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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 specifications for two proposed batteries and an existing battery for a 20/25 HP Car.

Identifier  ExFiles\Box 58\4\  Scan017
Date  20th January 1932
  
DEPARTMENT CORRESPONDENCE. HEAD OFFICE.
Ref. x(613?) JAH/CA.
To Mr. Dean. Customer's Name
ROLLS ROYCE.
Date 20.1.32.
2, 6 volt units. 20/25 H.P. Car.

Proposed battery: (a) Ebonite container, without cover, Battery type 2/3-XR9-1H.
Per cell:- 4 Positive plates, 5 11/16"W. 4 7/8"L. 5/32" (plate body)
3 Negative " 5 11/16"W. 4 7/8"L. 1/8" (plate body) INTER.
2 Negative " 5 11/16"W. 4 7/8"L. 3/32" (plate body) END.

Plate pitch: 9/16"
Double Separation.
Deposit space: 1 1/8"
Weight per 6-volt unit, charged, 44 lbs.(calculated).
Capacity: 70 A.H/20 hrs.
Overall dimensions of 6-volt unit; 6 15/16" x 9" x 9 3/8".

Alternative proposed battery: (b) Ebonite container, without cover, Battery type 2/3-XR7-1H.
Per cell:- 3 Positive plates, 5 11/16"W. 4 7/8"L. 5/32" (plate body)
2 Negative " 5 11/16"W. 4 7/8"L. 1/8" (plate body) INTER.
2 Negative plates, 5 11/16"W. 4 7/8"L. 3/32" (plate body) END.

Plate pitch: 3/4"
Double Separation.
Deposit space: 1 1/8"
Weight per 6-volt unit, charged, 40-lbs. (calculated).
Capacity: 52 1/2 A.H/20 hrs.
Overall dimensions of 6-volt unit; 6 15/16" x 9" x 9 3/8".

Existing battery: Ebonite container, with cover, Battery type 6-XSM7-1L.
Per cell:- 3 Positive plates, 5 3/4"W. 5 1/2"L. 5/32" (plate body)
4 Negative " 5 3/4"W. 5 1/2"L. 1/8" (plate body).

Plate pitch: 9/16"
Double Separation.
Deposit space: 1 1/4" (was 3/4" in XL3 wood tray battery).
Weight per 12-volt unit, charged, 79-lbs. (calculated).
Capacity: 52 A.H/20 hrs.
Overall dimensions of 12-volt unit: 6 3/4"W. x 14 3/16"L. x 11"H.{Arthur M. Hanbury - Head Complaints}

Form No. 719 500. Pads 3-31.
  
  


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