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).
Table of performance data for experimental chassis lighting and starting batteries.
| Identifier | WestWitteringFiles\D\May1920\ Scan56 | |
| Date | 10th May 1920 | |
| X. 664. TABLE OF PERFORMANCES of EXPERIMENTAL CHASSIS LIGHTING & STARTING BATTERIES. 10.5.20. | Ref. No. | Maker and X. No. | Description | Weight complete with case and acid (lbs). | Rated a.h. capacity (10 hr rate) | Ia Actual capacity at constant current of 1/10 rated capacity (to 10.5 volts) (a.h.) | Ib Actual capacity at constant current of 75 amps. to 10 volts (a.h.) | Ampere hours per pound. | II Initial current through .0763 ohm and time to fall to 100 amps. | III Number of contacts to 9.0 volts at 100 amps intermittent discharge on starter motor 9.5 secs. on 1.5 secs. off | IV Time of discharge (hours). | |---|---|---|---|---|---|---|---|---|---|---| | | | Type. | Cell: or Ebon: | | | | | | Amps. | Mins. | | | | 1 | C.A.V. 560 | T.66 | C | 105 | 66 | 70.8 | 56.6 | .675 | .539 | 143 | 8.06 | 88 | 4.5 | | 2 | Lucas 2 2676. | 1260 | C | 94 | 60 | 78.3 | 62.5 | .833 | .665 | 142 | 7.52 | 65 | 6.35 | | 3 | P & R 3398 | PDL9 | C | 84 | 60 | 45.0 | 36.7 | .536 | .437 | 137 | 7.11 | 93 | 4.5 | | 4 | Chloride 607 | 6BXE6 | E | 98 | 66 | 78.0 | 75.0 | .796 | .765 | 134 | 18.26 | 159 (137 for 6BXE5 (a)) | 6.95 | | 5 | Fuller 646 | SQ12/4 B. | E | 72 1/4 | 53 | 32.5 | 33.2 | .448 | .458 | --- | --- | --- | --- | | 6 | Tudor 979 | CLG 9 | E | 82 1/2 with box | 60 | 58.5 | 54.5 | .708 | .660 | 113 | 12.90 | ---- | 5.75 | | 7 | Tudor 979 | CLG 7 | E | 65 3/4 with box. | 45 | 36.0 | 33.8 | .550 | .516 | --- | --- | ---- | 5.75 | | 8 | P & R 3398 | PDL 7 | E | 74 | 45 | 31.5 | 26.2 | .426 | .354 | 134 | 5.27 | 43 | 3.0 | | 9 | Tudor | CLG 9 | C | 80 with box | 60 | 55.5 | 50.0 | .694 | .625 | 103 | 9.0 | -- | 5.5 | | ||