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).
The testing and performance of a Nickel-Iron (Ni-Fe) battery.
| Identifier | WestWitteringFiles\L\2April1924-June1924\ Scan73 | |
| Date | 15th May 1924 | |
| Contd. -2- EFCL/T15.5.24. The first and second of these batteries are in size and shape unsuitable for the chassis, but could be carried on the footboard. The third has been made up to our standard dimensions for acid batteries and could be put in the present standard Exide box. Ni-Fe Battery. This battery is not identical with the one reported in above mentioned reports, in fact the cells are arranged quite differently, but is of similar size and appearance, for which the makers claim improved performance due to a new mechanical construction of electrodes, also by altering the composition of the active paste. Their claim appears to be partially justified as compared with the previous battery, though not sufficiently so favourably to compare with the acid battery. This battery was received in a charged condition on 19.11.23 and first put through our routine tests. The low rate discharge results, as compared with the rated capacity were satisfactory. On the high rate discharge, discharging through an invariable external resistance of .100 ohm, the initial amperes were 107, and time to fall to 100 amperes 5.0 minutes. Further low and high rate discharges of this battery have been taken more recently. On the new low rate discharge, the standardised invariable external resistance for which is now 1.80 ohms, (this being a suitable resistance for the discharge of an actual 65 ampere-hour battery on the 10 hour rate in 10 hours, the discharges being carried out automatically overnight, the discharge switching itself off when the voltage falls to a suitable value, and a graphical record of this discharge being observed,) the battery gave 63.7 ampere-hours to 10.5 volts, i.e. .52 ampere-hour per lb. A photostat copy of this and other records referred to will be found attached. Contd. | ||