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 table of specifications for three different types of batteries.
| Identifier | ExFiles\Box 58\4\ Scan239 | |
| Date | 22th January 1936 | |
| TYPE WEIGHT WET WITHOUT COVER WEIGHT SAVING COMPARED WITH 6-BHD11-S. CAPACITY A.H. AT 20 HOUR RATE STARTING EFFORT BASED ON AREA OF POS. SEPARATOR THICKNESS PLATE THICKNESS POS. NEG. REMARKS. 6-BHD11-S 85 lbs -- 78 1 .076" wood .018" ebonite .125" .094" Dual Separation. 6-GL{G. Linnett}13 container. 6-LGL13-S (Special) 76 lbs 9 lbs. 68 1 .066" wood .094" .094" 6-GL{G. Linnett}13 container. Single wood separators. 6-LZL13-S (Special) 69 lbs. 16 lbs. 60 1 .066" wood .018" ebonite .078" .072" Dual separation. 6-GL{G. Linnett}13 container. 22.1.36. | ||