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 specifications for three different lighter batteries available for Bentley vehicles.
| Identifier | ExFiles\Box 58\4\ Scan232 | |
| Date | 10th January 1936 guessed | |
| FP{F. Potts} Y6021 DETAILS OF LIGHTER BATTERIES AVAILABLE FOR BENTLEY. Standard Proposed battery Alternative 6BHD.9-S. 6 HZD.9-S. 6.VBD.11-S. Dimensions 14 1/8" x 6 1/2" x 6 1/4" 1 11/16 shorter but standard container. taller than standard. Weight. Battery. 56 3/4 lbs. 45 1/4 lbs. 49 1/4 lbs. Lid.{A. J. Lidsey} 2 1/4 lbs. 2 lbs. 2 1/2 lbs. Capacity. 58 amp hrs. 54 amp hrs. 62 1/2 amp hrs. 20 hr. rate. Starting effort. 1 1.1:1 1.25:1 Average life. 2 years. same as 6 HZD. 9-S. Cost. same as standard. more expensive than standard. | ||