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).
Comparison of various battery types, detailing their discharge curves, capacity results and weights.
| Identifier | ExFiles\Box 54\2\ Scan047 | |
| Date | 17th October 1924 | |
| Contd. -9-7 EFCL/T17.10.24. more particularly with the Exide 6EXRE5 batteries, and either of the two should give excellent service. They are precisely in accordance with our up-to-date specification No.301, copy of which we attach hereto. Typical high rate discharge curves of the various batteries mentioned above are given on photostat copy of sheet T herewith. The curve of the P & R RR.LL/1 battery does not appear as good as that for the Exide 6.RRS/1/2. This is because these curves are taken early in the life of the batteries and it is known from experience with other P & R batteries that the P & R curve will increase progressively for a time, whilst it is not anticipated that the Exide will. Typical low rate discharge capacity results of actual discharge through a constant external resistance of 1.17 Ohm are as follows :- Exide 6DXRE5. 58 ampere-hours. Weight 83 lbs. Exide 6EXRe/SPL. 57 " " 88 lbs. P & R BDT.11. 46.0 amp.hours initially,i increasing to 57.0 amp.hours." 95 lbs. Accu-Slem. 52.0 ampere-hours after con- siderable use. Weight 86 lbs. Lithanode. 46 ampere-hours initially, 92 lbs. with a tendency to increase. Fuller Sparta.. .. 109 ampere-hours. " 103&1/2lbs. Exide 6RRS/1 51 " " 103 lbs. P & R RR.11. 53 amp.hours initially with a tendency to increase. " 103 lbs Contd. | ||