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).
Chassis 12-EX after 6000 miles, detailing battery and ammeter performance.
| Identifier | ExFiles\Box 54\1\ Scan214 | |
| Date | 19th August 1926 | |
| X4617S Extract from GWH {George W. Hancock - Head Chateauroux} 1/RP19.8.26. REPORT ON CHASSIS 12-EX. EAC.8 AFTER 6000 MILES. Battery. X.4617S. Battery fitted with half Exide and half P & R cells. The battery is still in good condition. The Exide cells retain the acid much better than the P & R It has been necessary to refill the P & R frequently and at 6000 M. {Mr Moon / Mr Moore} we had to add acid to these to bring them up to the required density. The difference at this mileage of the density being:- Exide specific gravity 1.239 P & R " " 1.189 .-. These were brought up to S.G. of 1.239 We have during the test run half the miles with no charge; the remainder on charge; and from previous experience of batteries we have not had the amount of evaporation. Very little water has been added generally. Elliott ammeter No.140999. X.4622. This is in good condition and has operated satisfactorily. | ||