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 a battery.
| Identifier | ExFiles\Box 58\3\ Scan189 | |
| Date | 20th April 1931 | |
| ELECTRICAL EXPERIMENTAL RECORD SHEETS. TEX No 4642P P+RTBD7E-16 Battery (226) Date on. | Location. | Date off. | REMARKS. | Miles reading start. | Miles reading finish. | Miles covered | Total miles. --- | --- | --- | --- | --- | --- | --- | --- 26-4-30 | Lab. | 14-8-30 | Received charged. | | | | 14-8-30 | 189EX | 5-9-30 | | 91 | 300 | 209 | 209 22-10-30 | " | 14-11-30 | | 648 | 1493 | 845 | 1054 14-11-30 | " | 6-1-31 | | 1493 | 12602 | 11109 | 12163 6-1-31 | " | 17-1-31 | | 12602 | 13744 | 1142 | 13305 17-1-31 | Bench Test | 4-2-31 | Results good | | | | | | | | Report JD {J. Draper - Frames} /116. 4-2-31 | | | | No further record kept F.J 20-4-31. | ||