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).
Results of a battery life test.
| Identifier | ExFiles\Box 164\1\ img266 | |
| Date | 7th November 1940 | |
| Rm{William Robotham - Chief Engineer}/RC.{R. Childs}4/LT.7.11.40 - 2 - LIFE TEST: This test consisted of repeatedly discharging and charging the battery at the rate of one cycle per day for 5 days per week, until it was worn out; the number of cycles being a measure of the life of the battery. The discharges were carried out in series of 20 at the seven-hour rate, alternating with series of 5 at 240 amperes, approximately the 5-minute rate. Charging was at the normal rate and carried out during the night. Total No. Cycles 195 Cycles at low rate 160 Cycles at high rate 35 Yours faithfully, | ||