Battery efficiency tests concluding a 70% figure is correct based on replacement charge data.
| Identifier | WestWitteringFiles\H\January1922\ Scan47 | |
| Date | 1st January 1922 | |
| Contd. -3- EFC {E. Fowler Clarke - Electrical Engineer} /132.1.22. That this efficiency figure is approximately correct was confirmed by a preliminary test in which an efficiency of 70% was assumed, so that after each high rate discharge 43% more ampere-minutes were replaced than were taken out, and we have found that in these circumstances the battery appeared to keep reasonably fully charged, after each replacement charge. EFC. {E. Fowler Clarke - Electrical Engineer} | ||
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).