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).
Table of readings taken on various battery cells showing their condition and voltage measurements.
| Identifier | WestWitteringFiles\O\2April1926-June1926\ Scan053 | |
| Date | 22th April 1926 guessed | |
| -2- Contd. Below are a few readings taken on various cells and it will be seen that some show positive weakness and others negative weakness. Type of cell tested. | Condition of cell. | Terminal voltage. | +ive plate > 2.05 | -ive plate < 0.25 Hart. | Discharged. | 1.80 | 2.0 | .20 Accu-Slem. | " | 1.80 | 2.05 | .25 Exide MA.3 | " | 1.80 | 2.10 | .30 Exide BX4. | " | 1.80 | 2.0 | .20 Multiple Storage. | Reversed. | -1.40 | .95 | 2.3 Exide BXRE5. | Discharged. | 1.60 | 2.10 | .50 P & R.3A. | " | 1.85 | 1.95 | .10 P & R BDT.11 | " | .06 | .29 | .23 " | " | 1.0 | 1.25 | .25 Accu-Slem. | Shorted. | 0 | .10 | .10 Exide SPL. | Discharged High rate. | 1.75 | 2.05 | .30. " | " | 1.20 | 1.95 | .75 EFC/G.J. | ||