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 results for a 6-cell, 9.3-volt battery weighing 29 lbs, showing voltage readings before and after discharge.
| Identifier | ExFiles\Box 1\7\ B001_X15 20 46 50 59-page251 | |
| Date | 23th December 1913 | |
| A.G.Ionides Esq., -2- 23/12/13. (2). Test with battery of 6 cells 9.3 volts. Weight 29 lbs. | Amps. | Volts. | | |----------------------------|------------------------------------------|----------| | Discharged for 5 mins. at | Start 5 mins. rest between each test. | Finish. | | 10 amps. | 9.3 v.{VIENNA} | 7.9 | | 15 " | 9.2 " | 7.2 | | 20 " | 9.1 " | 6.45 | | 25 " | 8.9 " | 5.55 | | | 2nd test. | | | 10 " | 8.75" | 7.35 | | 15 " | 8.6 " | 6.65 | | 20 " | 8.5 " | 5.9 | | 25 " | 8.4 " | 5.0 | | | After 30 mins. rest 8.7 volts. | | Yours faithfully, | ||