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 performance of electrical cells, comparing them to Edison and Exide cells.
| Identifier | ExFiles\Box 1\7\ B001_X15 20 46 50 59-page212 | |
| Date | 13th March 1913 | |
| AW/E10/L13313 (2) 13/3/13 I cannot report very favourably so far as regards above cells re output. It has a very bad percentage compared with others (Acid) 16 amp. hours or 140.8 watt hours at a discharge (continuous) of 1.amp. per hour. At a discharge of 5 amps.(continuous) which is under the normal discharge (7 amps.) it shows even worse being of an average of 5 to 10 amp. hrs. According to the varying rate of discharge and when left standing recovering themselves to such a great extent these cells point to great internal resistance and polarising. I do not think they would be suitable for lighting system owing to the varying discharge. They may stand alright on the battery coil circuit owing to their being intermittent and allowing them time enough to recover themselves. (see later report) The lugs require a quick taper as they get frosted on and cause a great strain on the plate joint which seem rather weak. Comparison as regards weight :- Edison's. Total weight including tray - 32½ lbs for 8.5 volts Exide cells including box. - 15 lbs for 4 volts. (see later weight comparisons) These do not compare as they state for lightness. These cells I am putting into daily use for coil testing and will report again later. [stamped initials] | ||