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).
Comparison of voltage characteristics for Exide and Edison battery cells during charging and discharging.
| Identifier | ExFiles\Box 1\7\ B001_X15 20 46 50 59-page231 | |
| Date | 19th July 1913 guessed | |
| Wor{Arthur Wormald - General Works Manager}/EM3/L18713. (contd) -2- Exides 4 volts. 4.2 volts at the commencement of discharge after fully charging. 3.6 volts at which the cells must be recharged. ------ .6 volts variation on 4.2 V = 14.3% Variation of voltage charging. Edisons 12 volts. 11.8 volts at the commencement of charge 16.6 " finish of charge with charge on. ------ = 4.8 volts variation on 16.6 volts = 28.9% Exides. 4 volts. 4.0 volts at the commencement of charge 5.6 " finish of charge with charge on ------ = 1.6 volts variation on 5.6 V.{VIENNA} = 28.9% These cells are discharged to 10.8 v and 3.6 v respectively but always rise again when left standing for a short time, this is more pronounced in the Edisons. p. Wor.{Arthur Wormald - General Works Manager} 21 | ||