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. | ||
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).