Comparison of C.A.V-Willard, U.S.A. Willard, and Exide batteries, discussing weight, capacity, efficiency, and lifespan.
| Identifier | WestWitteringFiles\G\August1921\ Scan53 | |
| Date | 12th August 1921 | |
| Contd. -3- EFC {E. Fowler Clarke - Electrical Engineer} 2/T12.8.21. C.A.V-Willard are round about 80 lbs. only, whereas their lighting capacities are about 55 and 65 ampere-hours. The U.S.A. Willard battery, also of weight round about 80 lbs., although rather low in low rate discharge capacity, 50 a.h., was quite good on high rate discharge capacity. The query suggests itself as to whether the reduction of electrical efficiency is really necessary for good life, as it must be remembered that failures we have experienced in the Exide cells have not really been due to these being electrically efficient, and with the recent modifications, with still a reasonable electrical efficiency, it is not yet apparent that the life of the battery will be short. EFC. {E. Fowler Clarke - Electrical Engineer} R.R. 235A (100 T) (S.H. 159 11-8-20) G. {Mr Griffiths - Chief Accountant / Mr Gnapp} 2800 | ||
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).