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).
Experimental record sheet tracking the mileage and performance of an Exide battery.
| Identifier | ExFiles\Box 168b\3\ img097 | |
| Date | 6th December 1929 | |
| X 7535E ELECTRICAL EXPERIMENTAL RECORD SHEET. F79369 IXNO 7535E Exide 3RRS-1EL-2 Battery (210) Table Data: | Date on. | Location. | Date off. | Remarks. | Miles Readg. Start. | Miles Readg. Finish. | Miles Covered | Av. Miles Per Week. | Total Miles. | |---|---|---|---|---|---|---|---|---| | 23-4-29 | Lab. | 1-5-29 | Received charged weight 55 lbs with lid{A. J. Lidsey} | 3995 | 5935 | 1940 | | 1940 | | 1-5-29 | 21EX | 1-6-29 | | 5935 | 8540 | 2605 | | 4545 | | 1-6-29 | " | 15-6-29 | | 8540 | 11179 | 2639 | | 7184 | | 15-6-29 | " | 12-8-29 | | 11179 | 11853 | 674 | | 7858 | | 12-8-29 | " | 14-9-29 | | 11853 | 11852 | 674 | | 8367 | | 14-9-29 | " | 4-11-29 | | 11,852 | 14,237 | 2385 | | 10752 | | 4-11-29 | " | 6-12-29 | | 14,237 | 15,842 | 1605 | | 12357 | | 6-12-29 | " | | Battery gone with car to adj. | 15,842 | | | | | | ||