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).
Letter from an external supplier regarding life test results of an Exide battery.
| Identifier | ExFiles\Box 164\4\ img307 | |
| Date | 23th December 1936 | |
| 6122. ALL COMMUNICATIONS TO BE ADDRESSED TO THE COMPANY THE Chloride ELECTRICAL STORAGE COMPANY LIMITED EXIDE WORKS, CLIFTON JUNCTION, NR MANCHESTER. LONDON OFFICE, 137, VICTORIA STREET, S.W.1. TELEPHONES: SWINTON 2011 (7 LINES) TELEGRAMS: CHLORIDIC, PENDLEBURY. CODES: BENTLEY'S, LIEBERS, A.I. AND A.B.C. (4TH & 5TH EDITIONS) Handwritten note: J.J. How do you explain this? WFP OUR REFERENCE ECM/LJ. YOUR REFERENCE ......................................... Messrs.Rolls-Royce, Ltd., Derby. 23rd December, 1936. For attention of Mr.H.E.West. Dear Sirs, We beg to refer to the correspondence commencing with letter reference "Tm/Wst.33/JE" of October 30th, re life tests which had then been recently concluded on an Exide battery. We were asked to state whether 81 cycles was a normal result, and in our reply of November 2nd we could not agree, and requested permission to investigate the matter, which you kindly agreed to in your letter of November 3rd. Our Mr.Coates visited your Works on November 10th, and although he was unable to point out in what way the results had been affected, he could not see from an external inspection why the cells should not give normal results, and you kindly arranged for the battery to be returned to us. On receipt, after topping up with acid 1.190 sp.{Mr Spinney}g. the battery was given a 20-hour conditioning charge at 5 amperes and the specific gravity of the electrolyte finally adjusted to 1.280 at 70°F.{Mr Friese} The cells were then subjected to cycles of discharge and recharge. First a discharge at the 1-hour life test rate, i.e., 40 amperes to 10.2 volts. The battery gave 1 hour 33 minutes at this rate to 10.2 at an initial temperature of 69°F.{Mr Friese}, finishing at 72°F.{Mr Friese} Five cycles of charge and discharge were taken on the life test schedule adopted by you (34.5 amperes discharge for one hour, 11.5 amperes recharge for four hours) and the voltage of the battery at the end of one hour's discharge of each cycle was as follows:- | ||