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).
Graph chart recording the results of a battery charge and discharge test.
| Identifier | ExFiles\Box 54\1\ Scan169 | |
| Date | 6th July 1927 | |
| 6-7-27 182 P&R RR11-3 75 a.h. 97 lbs. Charged at a constant current of .6 amperes for 16 hours. Average amperes = 6.4 Hours = 13.2 Ampere hours = 84.5 .871 1.80 w TRADE MARK KENT GEORGE | ||