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. | ||
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).