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).
Tests on charging a P & R RR11-3 battery to a modified characteristic of V = 16 - .15 A.
| Identifier | WestWitteringFiles\R\2October1927-November-1927\ 10 | |
| Date | 18th July 1927 | |
| EFC. JC.92. 18.7.27. RE BATTERY CHARGING TO MODIFIED CHARACTERISTIC OF V = 16 - .15 A.{Mr Adams} Tests on charging to a modified characteristic of V = 16 - .15 A were carried out on a standard P & R RR11-3 battery. The battery was first charged at a continuous current of 6 amperes for approx. 16 hours, when the density (1270) and voltage (15.9) had remained constant for a few hours. On low rate discharge through a constant external resistance of 1.80 ohms, 84.5 ampere-hours were obtained. The battery was then charged to the modified characteristic as stated above. The charge commenced at 22 amperes 12.7 volts, and tapered down to finally 3 amperes in about 10 hours. The maximum sustained P.D. was 15.5. It was then discharged as before and 82.4 ampere-hours were obtained. This process was repeated three times and each discharge shewed a slight improvement, as will be seen by the curves, which tends to show that repeated charging to this characteristic does not reduce its capacity. As a proof a further discharge was taken after having being charged at a continuous current of 6 amperes and 84.0 ampere-hours were obtained. By the above results it appears that a battery can be fully charged to this characteristic although it does not reach such a high P.D. as when charged at a continuous current. EFC/G.Johnson. | ||