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 showing terminal and plate voltages for various battery cells under different conditions.
| Identifier | WestWitteringFiles\O\2April1926-June1926\ Scan051 | |
| Date | 14th February 1926 | |
| Contd. -3- EFCl/T2614.26. | Type of cell tested. | Condition of cell. | Terminal Voltage. | +ve plate / 2.05. | -ve plate / 0.25. | |----------------------|-------------------------|-------------------|-------------------|-------------------| | Hart. | Discharged. | 1.80 | 2.0 | .20 | | Accu-Slem. | Discharged. | 1.80 | 2.05 | .25 | | Exide MA.3. | Discharged. | 1.80 | 2.10 | .30 | | Exide BX.4. | Discharged. | 1.80 | 2.0 | .20 | | Multiple Storage. | Reversed. | -1.40 | .95 | 2.3 | | Exide BXRE5. | Discharged. | 1.60 | 2.10 | .50 | | P & R.3A. | Discharged. | 1.85 | 1.95 | .10 | | P & R BDT.11. | Discharged. | .06 | .29 | .23 | | P & R BDT.11. | Discharged. | 1.00 | 1.25 | .25 | | Accu-Slem. | Shorted. | 0 | .10 | .18 | | Exide SPL. | Discharged high rate. | 1.75 | 2.05 | .30 | | Exide SPL. | Discharged high rate. | 1.20 | 1.95 | .75 | In any case where a lot of cells have to be dealt with, the cadmium electrode should be used, together with a reasonably sensitive voltmeter, but the indications are of most value when the terminal P.D. is, through discharge or otherwise, on the point of falling below 1.8 EFC. pp.3 and 4 attached. | ||