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).
Correct acid density and charging procedure for a Chloride 6 BXE 5 battery.
| Identifier | ExFiles\Box 26\2\ Scan076 | |
| Date | 23th December 1919 | |
| X.995. ToEP. from Ck.{Mr Clark} CK{Mr Clark}5/T23.12.19. X.607 - RE CARE OF CHLORIDE 6 BXE 5 BATTERY X.995. In answer to your note EP{G. Eric Platford - Chief Quality Engineer}/T7/F22.12.19, giving Mr. Northey's comments on some of our instructions for the care of batteries, our remarks are as follows :- 1. The instructions on the batteries give the density of acid, as first put in to dry cells, as 1320. We have never seen recommended the use of acid of density as high as 1350, and it is generally known that the use of acid of too high a density is deleterious to the plates. The reason the Chloride people specified 1320 specific gravity is that during the first charge the density falls considerable, especially in the early stages, and as they do not suggest changing the acid in the first instance, it is necessary to start with acid of a high density in order that the density at the end of the charge shall be correct. From our own experimental work, we are of the opinion, and this is supported by the recommendations from other sources, that it is best to carry out the first charge with acid of comparatively low density, afterwards to change the acid so that with the battery in a fully charged condition, the density shall be made right. Another good reason for our recommendations is the fact that it is highly improbable that supplies of acids of different densities will be available. Contd. | ||