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).
Test chart showing the discharge performance of an Exide 6BXRE5-FF battery.
| Identifier | ExFiles\Box 49\5\ Scan360 | |
| Date | 14th February 1924 | |
| 134. Exide 6BXRE5-FF 82.5 lbs 60 ah 14 - 2 - 24 Average amperes = 6.44 hours = 8.0 Ampere hours = 51.5 .624. 1.80ω REGD. TRADE MARK | ||