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 of terminal potential differences on a standard D&R battery during charging at various amperages.
| Identifier | ExFiles\Box 54\1\ Scan078 | |
| Date | 11th January 1926 | |
| R.R. 300 (20 Bks.) (SK 354 5-12-22 MP 264049) X4617P 108714 ROLLS-ROYCE LIMITED. INSTRUCTIONS. To: E.T.L. Date: 11-1-1926 Order No.: Customer's No.: Re: J.B.141. Re terminal P.D's. on Std. D&R Battery. The terminal P.D's. on a Standard D&R RRII 40/50HP battery were taken when charging at various rates & the results tabulated as below. Cells. | Amperes. | 1 | 2 | 3 | 4 | 5 | 6 | Total P.D. | | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | | 12.0 | 2.79 | 2.79 | 2.79 | 2.78 | 2.76 | 2.79 | 16.70 | | 10.0 | 2.75 | 2.75 | 2.75 | 2.75 | 2.71 | 2.76 | 16.47 | | 9.0 | 2.73 | 2.73 | 2.73 | 2.70 | 2.75 | 2.76 | 16.37 | | 7.0 | 2.70 | 2.70 | 2.70 | 2.70 | 2.68 | 2.71 | 16.19 | | 5.0 | 2.68 | 2.68 | 2.68 | 2.68 | 2.63 | 2.69 | 16.04 | | 3.0 | 2.60 | 2.60 | 2.60 | 2.60 | 2.58 | 2.60 | 15.50 | E.M.F. immediately after switching off a charge of 12.0 amperes = 2.70. 16.2 volts. QK. Signed: S.G. This Sheet must be filed on completion of the work. | ||