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 Ediswan Battery (221) after 10 months of bench life testing.
| Identifier | ExFiles\Box 52\4\ Scan056 | |
| Date | 3rd April 1930 | |
| E.F.B. J.D. 68. X. 4502 3-4-30 X4502 Tests on Ediswan Battery (221) This battery is now 10 months old & has been on our bench life test during that time. The bench tests shew some improvement on the routine tests, but the battery has a greater internal resistance as shewn by the high rate curves. On Low Rate Discharge the battery gave 77.5 ampere hours & all cells shewed positive weakness. On High Rate Discharge Initial amperes = 104.7 Time to 10v " = 3.5 min " " 100 " " = 11.6 " Amperes at 20 min = 92.1. All cells shewed negative weakness. q.f. | ||