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).
Chart recording of a discharge test for an Exide battery, model 6RR5/1/2.
| Identifier | ExFiles\Box 54\2\ Scan193 | |
| Date | 21th May 1925 | |
| 21-5-25 146 Exide 6RR5/1/2 103 lbs 80 a.h. Average amperes: 6.4 Hours = 12.75 Ampere hours = 81.6 .79v. 1.80v REGD TRADE MARK 'MEGGER' B.104 AHVIVE 22.5.25 | ||