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).
Results of performance tests on Edison cells.
| Identifier | ExFiles\Box 1\7\ B001_X15 20 46 50 59-page247 | |
| Date | 19th December 1913 | |
| From Exp. Dept. Copies for: J.{Mr Johnson W.M.} R.{Sir Henry Royce} E.{Mr Elliott - Chief Engineer} Na.{Mr Nadin} X.50. Wor{Arthur Wormald - General Works Manager}/EH1/L191213. December 19th. 1913. Report on Edison Cells. X.50. Below are particulars of tests with the above cells. (1) Battery of 9 cells fully charged 13.05 volts. Weight without box 44 lbs. Volts. Discharged for 5 mins. at | Start. 5 mins. rest between each test. | Finish. 10 Amps | 13.05 V | 10.65 V 15 " | 12.85 " | 9.6 " 20 " | 12.65 " | 8.2 " 25 " | 12.35 " | 6.7 " 30 " | 12.05 " | 5.45 " After 30 mins. rest 12.3 volts. (2) Test with battery of 6 cells 9.3 volts. Weight 29 lbs. Volts. Discharged for 5 mins. at | Start. 5 mins. rest between each test. | Finish. 10 Amps | 9.3 V | 7.9 V 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 | ||