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).
Graph showing the discharge voltage curves for an STXR9A battery.
| Identifier | ExFiles\Box 164\3\ img038 | |
| Date | 1st August 1937 | |
| JOSEPH LUCAS LTD. FORMANS ROAD STXR9A BATT DISCHARGE VOLTAGE CURVES PD TYPICAL CU 333 AMPS. 200 MINUTES DISCHARGE Form No. 1352/A/500 8/37 | ||