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).
Confirming fitment and providing dimensions for two Exide battery models in the 20 HP battery box.
| Identifier | ExFiles\Box 164\4\ img005 | |
| Date | 22th January 1931 | |
| X4378. 22.1.31. X.4378 20 HP. BATTERY BOX. A week or two ago Roy {Sir Henry Royce} /Ms. enquired whether the 6XL3-4 battery would go in the box originally made for the 6XR3-1 battery. The answer to this query was in the affirmative. The dimensions of the two batteries being as follows :- Exide 6XR3-1 13.812" x 7.312" x 9.250" Exide 6XL3-4 13.562" x 7.500" x 9.875" EFC. {E. Fowler Clarke - Electrical Engineer} | ||