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).
Test report on an ST Battery, detailing its mileage, age, and performance under various discharge rates.
| Identifier | ExFiles\Box 54\5\ Scan119 | |
| Date | 18th July 1929 | |
| E.Z.C. J.D.16. X3839. 18-7-29 X46175. Re Tests on ST Battery (181) This battery has ran 25,820 miles on the road & has been on our bench life test 12 months & is now 37 months old. On Low Rate Discharge through a constant external resistance of 1.80w 45.2 ampere hours were obtained. The Exide threaded rubber cell & P&R standard cell had the poorest capacity & shewed positive weakness. On High Rate Discharge through a constant external resistance of .100w Initial amperes 105.9 Time to 104 " = 4.0 min " " 100 " = 6.8 " " " 90 " = 12.6 " " " 80 " = 15.6 " All cells shewed negative weakness. As regards performance on this test the cells stand in the following order: P&R Threaded Rubber. Rib + Exide Standard. P&R Threaded Rubber Flat + (cont'd) | ||