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 discharge capacity and voltage tests of a sample Nickel-Iron (NI-FE) battery cell.
| Identifier | WestWitteringFiles\F\January1921\ Scan0 | |
| Date | 1st January 1921 | |
| R.R. 235A (100 T) (S H.{Arthur M. Hanbury - Head Complaints} 159. 11-8-20) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 2800 ORIGINAL. To R.{Sir Henry Royce} from EFC. C. to CJ. EFC1/S1.1.21. X.3727. NI-FE BATTERY. We are sending to you under separate cover a sample cell similar to those of the type X.6010 Alkaline battery which we reported to you some time ago. This cell is open so that you may see the construction of the plates and one of the plates has been removed by us to see if there was any difference in the construction of the plates of positive and negative polarity. One of the makers claims in regard to this type of Alkaline battery is that the voltage variation has been reduced to a minimum. Though we took the voltage figures during the low rate discharge capacity tests we did not previously report these figures to you. During the first discharge at 6.0 amperes the terminal voltage was 13.0 at the start (current passing) this gradually fell to 12.0 in 5 hours (the starting current being maintained) next day it started at 12.4 and fell to 11.0 fairly regularly in 4 hours. The ampere hour capacity at this 6 amperes rate of discharge to 10.5 volts was 54.15. The second time at 6.0 amperes it gave 60 ampere hours. In this case the voltage started at 13.6 and the discharge was stopped at 10.5 volts. Contd. | ||