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).
Comparison of the total weights for a standard Exide battery and a Peto & Radford BD.11 battery, including their respective boxes and fittings.
| Identifier | ExFiles\Box 38\5\ Scan239 | |
| Date | 27th July 1922 | |
| X3398 EFC/T27.7.22. X.4130. RE WEIGHTS OF BATTERIES. X1723 X.3398. Weight of present standard Exide battery 83 lbs. Weight of std. battery box with strap and footboard bolts. 16 lbs. Total weight. ------- 99 lbs. Weight of Peto & Radford BD.{Mr Berend}11 battery without lid.{A. J. Lidsey} 95 lbs. Weight of battery box lid{A. J. Lidsey} including securing screws and footboard bolts . 4 lbs. Total weight. --------99 lbs. EFC. | ||