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).
Battery charging tests, detailing charge cycles, cell densities, and temperatures.
| Identifier | ExFiles\Box 54\1\ Scan181 | |
| Date | 1st July 1925 | |
| -3- (13) Third charge equivalent to average current of 6.0 amperes for 16.5 hours. i.e. ampere-hours = 99.0 (14) Cell densities. (1) 1280 (4) 1250 (2) 1250 (5) 1280 (3) 1280 (6) 1250 (15) Initial amperes = 103 Temp :- 18°C 64°F. {Mr Friese} [Handwritten note on left] Ex-1.5 voltages of P&R 1.45 each cell on Box 1.0 discharge P&R 1.6 when at 20.0 Box 1.25 amperes. P&R 1.25. Time to 104 amperes:- mins. " " 100 " : 6.4 " " " 90 " : 14.6 " " " 80 " : 16.7 " (16) Fourth charge equivalent to average current of 6.0 amperes for 17.0 hours. i.e. ampere-hours = 102.0 (17) Ampere hours realised up to a point where record takes a sudden turn down :- 61.8. Temperature :- 19°C 66°F. {Mr Friese} (18) Fifth charge equivalent to average current of <strikethrough>amperes</strikethrough> 6.0 amperes for 16.5 hours i.e. ampere-hours :- 99.0 ------------------- [Right column] Date. 1-7-25 to 2-7-25. 3-7-25. 3-7-25. 3-7-25 to 6-7-25. 7-7-25. 8-7-25 to 9-7-25 | ||