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 detailing the test results for a chassis lighting and starting battery from The Fuller Accumulator Co. Ltd.
| Identifier | ExFiles\Box 9\6\ 06-page49 | |
| Date | 11th May 1920 | |
| )--- 1320. 6 lines. X.646 EFC4/T. 11th May, 1920. The Fuller Accum: Co.Ltd., Woodland Works, Chadwell Heath, London, E.{Mr Elliott - Chief Engineer} Dear Sirs, X.646 Chassis Lighting & Starting Battery. X.646 With reference to the special chassis lighting and starting battery referred to in your letters ref. AW/EA of June 20th and 25th last, we are pleased to give you the results of our tests on this battery, as follows :- The weight of this battery with acid we find to be 87 3/4 lbs. We were much better pleased with the general appearance and construction of this battery than the previous pair which you submitted to us, which in our opinion were quite a failure. The cable connections and connecting links are good and well protected from corrosion and keep cool on high rate discharge. The vent plugs we found to be moderately good, but allowed of a little spraying when the battery was fully charged and freely gassing. Regarding the actual test through which this battery was put:- On receipt of the battery in a charged condition it was further charged to make sure of the charging being complete. We then discharged at 6.0 amperes to 10.5 volts in two periods separated by a night interval until the voltage dropped to 10.5, and we realised 51.0 ampere hours. The battery was then again fully charged and discharged at 10.0 amps. to 10.0 volts in one period in which discharge 42.5 ampere hours were realised. After again charging the battery it was subjected to a continuous high rate discharge test through a resistance of .0763 ohm. On this test the battery started off by giving 131.6 amperes, the current gradually falling to 120 amperes during a period of 5 3/4 mins. and then somewhat more rapidly to 100 amperes (or 7.63 volts) in a total period of 9.65 mins. Further tests consisted in intermittent high rate discharges through the same resistance. In the first of these two, there were alternating periods of 15 secs. on contact and 15 secs off; in the second, 15 secs. on contact and 45 secs. off. In both cases the battery started off by discharging at about 127.5 amperes, then fell to 100 amps. in 7.27 mins., and 5.35 mins. in the second case, the in the first case, Conta | ||