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 results for terminal potential difference of standard Exide batteries for 20HP and 40/50HP models.
| Identifier | ExFiles\Box 54\2\ Scan168 | |
| Date | 11th January 1926 | |
| RR 300 (20 Bks.) (SK 354 5-12-22 MP 264049 X4617 E 108714 ROLLS-ROYCE LIMITED. INSTRUCTIONS. To: E.T.G. Order No.: Customer's No.: Date: 11 - 1 - 1926 Re: J.B.17.D. Terminal PDs of Standard Exide Batteries The terminal PDs of Standard 20HP & 40/50HP Exide Batteries were observed when charging at 9 & 12 amperes respectively. The results are tabulated below. | Amperes | 20HP | 40/50HP | |---------|----------------|-----------------| | | cell no | 6XL3/4/1 | cell no | 6RR5/1/3 | | 9.0 | -1 | 2.71 | -1 | 2.69 | | | 2 | 2.71 | 2 | 2.70 | | | 3 | 2.68 | 3 | 2.69 | | | 4 | 2.68 | 4 | 2.69 | | | 5 | 2.68 | 5 | 2.70 | | | +6 | 2.68 | +6 | 2.70 | | 12.0 | -1 | 2.76 | -1 | 2.71 | | | 2 | 2.76 | 2 | 2.72 | | | 3 | 2.70 | 3 | 2.71 | | | 4 | 2.70 | 4 | 2.71 | | | 5 | 2.70 | 5 | 2.72 | | | +6 | 2.70 | +6 | 2.72 | More results wanted. Signed: G.J. This Sheet must be filed on completion of the work. | ||