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).
Battery test data from fourth and fifth charge cycles, with readings for P&R and Exide cells.
| Identifier | ExFiles\Box 168b\3\ img028 | |
| Date | 20th January 1930 guessed | |
| 449 contd. Date. (16) Fourth charge:- Charge given:- 90 ampere hours at 7 amperes. 11-1-30 to 14-1-30 | | P&R | | | Exide | | | | Cell No. | 1 | 2 | 3 | 4 | 5 | 6 | | Density | 1280 | 1280 | 1280 | 1280 | 1280 | 1290 | | Voltage | 2.65 | 2.65 | 2.65 | 2.65 | 2.65 | 2.65 | | +ve to cadmium | 2.45 | 2.45 | 2.45 | 2.45 | 2.45 | 2.45 | | -ve to cadmium | -.2 | -.2 | -.2 | -.2 | -.2 | -.2 | (17) Battery temperature :- 20°C. 68°F.{Mr Friese} 15-1-30 Ampere-hours realised up to point where record takes a sudden turn down:- 63.2 | | P&R | | | Exide | | | | Cell No. | 1 | 2 | 3 | 4 | 5 | 6 | | Density | 1150 | 1150 | 1150 | 1100 | 1100 | 1100 | | Voltage | 1.9 | 1.9 | 1.9 | 1.75 | 1.75 | 1.75 | | +ve to cadmium | 2.0 | 2.0 | 2.0 | 1.85 | 1.85 | 1.85 | | -ve to cadmium | .1 | .1 | .1 | .1 | .1 | .1 | (18) Fifth charge :- 115 ampere hours at 7 amperes. Charge given:- 16-1-30 to 17-1-30 | | P&R | | | Exide | | | | Cell No. | 1 | 2 | 3 | 4 | 5 | 6 | | Density | 1280 | 1280 | 1280 | 1280 | 1280 | 1280 | | Voltage | 2.65 | 2.65 | 2.65 | 2.65 | 2.65 | 2.65 | | +ve to cadmium | 2.45 | 2.45 | 2.45 | 2.45 | 2.45 | 2.45 | | -ve to cadmium | -.2 | -.2 | -.2 | -.2 | -.2 | -.2 | | ||