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).
Electrical experimental record sheet for an SU Battery (176), page 2.
| Identifier | ExFiles\Box 54\1\ Scan354 | |
| Date | 27th March 1930 | |
| ELECTRICAL EXPERIMENTAL RECORD SHEETS. XNO 46175 SU Battery (176) Page 2 Date on. | Location. | Date off. | REMARKS. | Miles reading Start. | Miles reading Finish. | Miles covered | Total miles. 17-7-29 | E.M.S. Bench Tests | 22-7-29 | Acid renewed. Report JD{J. Draper - Frames} 18. 20-7-29 | 27-3-30 | | | Cells to be used as spares | | ||