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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 table of various 6-volt batteries from manufacturers including National, Exide, and Ford.

Identifier  ExFiles\Box 164\4\  img019
Date  24th February 1931
  
X.6054. X.6021.

COMPARISON OF FORD 6-VOLT BATTERIES
WITH
R.R. 40/50 6-VOLT UNITS OF
NATIONAL AND EXIDE MANUFACTURE.

Maker. | Type. | Capacity 10-hour rate | Length (") | Width (") | Height (") | Weight including acid (lbs.) | Cat. Price £. s. d. {John DeLooze - Company Secretary}
--- | --- | --- | --- | --- | --- | --- | ---
National | 3-RRN11 | 72 | 10.625 | 5.875 | 10.75 to top of cover screw. 10.187 minus cover | 57 with cover | 5. 7. 3.
Exide | 3-RR5IL | 77 | Same dimensions as National. | | | 55 with cover | 5. 15. 0.
Exide | Ford 3-XCL31F | 76 | 9.375 | 7.562 | 9.250 | 44 | 3. 5. 0.
Exide | Ford 3-XCL31K | 76 | 9.062 | 7.00 | 9.125 | 44 | 3. 5. 0.
National | Ford 3-GX13A | 76 | 9.00 | 6.687 | 9.250 | - | 3. 5. 0.
National | Ford 3-GX13Z | 76 | 9.375 | 7.562 | 9.250 | - | 3. 5. 0.
U.S.A. Exide | 3-XCR13 -IRA | 70 (estimated) | 9.062 | 7.250 | 9.250 | 37.5 without acid. | -

24.2.31.
  
  


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