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 detailing the second charge cycle data and readings for a 6-cell battery.
| Identifier | ExFiles\Box 52\4\ Scan052 | |
| Date | 3rd June 1929 guessed | |
| -2- Date. 15-6-29 to 19-6-29 (6) Second charge :- Charge given :- 7 amperes for 20 hrs = 140 ampere hours (7) | Cell No. | 1 | 2 | 3 | 4 | 5 | 6 | |----------|------|------|------|-------|-------|------| | Density. | 1280 | 1280 | 1280 | 1280 | 1280 | 1280 | | Voltage. | 2.7 | 2.7 | 2.7 | 2.65 | 2.7 | 2.7 | | +v to cadmium. | 2.4 | 2.4 | 2.4 | 2.4 | 2.45 | 2.4 | | -ve to cadmium. | -.3 | -.3 | -.3 | -.25 | -.25 | -.3 | (8) Emptying and refilling, or adjusting densities and levels. (9) Applicable only if battery comes in charged. (10) | Cell No. | 1 | 2 | 3 | 4 | 5 | 6 | |----------|-----|-----|-----|-----|-----|-----| | Density. | --- | --- | --- | --- | --- | --- | | Voltage. | --- | --- | --- | --- | --- | --- | | +ve to cadmium. | --- | --- | --- | --- | --- | --- | | -ve to cadmium. | --- | --- | --- | --- | --- | --- | (10) Weight of battery 92 lbs. 0 ozs. (Date: 20-6-29) (11) Battery temperature:- 75°F 24°C. Ampere-hours realised up to point where record takes sudden turn down :- 69.1 (Date: 20-6-29) Contd. | ||