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 results from experimental tests on charging, lighting, and starting batteries.
| Identifier | WestWitteringFiles\G\June1921\ Scan90 | |
| Date | 6th August 1919 | |
| R.R. 63 (50 T) (S F.{Mr Friese} 846. 6-8-19) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 2459. -3- TABLE OF RESULTS OF EXPERIMENTAL CHARGING LIGHTING AND STARTING BATTERIES. (Handwritten top right): Remained charged | Ref. No. | Maker and A.No. | Description Cell Type. | Weight complete with case, acid & conn: lbs. | 1a Rated amp. hr. cap'ty. (10 hr rate) | 1b Actual cap'city at constant current of 1/10 rated capacity. (to 1.8 V) | 1c Actual cap'city at constant current of 49.13A (to 1.0 V) | Amp-hours per pound. | [No Header] | II Continuous Initial Current to fall to 100 amps. min. time. (Col 1) | II Continuous Initial Current to fall to 100 amps. min. time. (Col 2) | III Intermittent Current (a) Initial Amps. | III (b) Final Amps. | III (c) Time of Dis-charge mins.secs. | III (d) Time of Dis-charge (total) | III Time of Dis-charge (total) | (Handwritten) |---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|--- | 58 | Tudor BR.1 979 | E | 90.0 | 60 | 82.5 | 51.7 | .589 | .574 | 137 | 9.2 | 133 | 10.25 | 189.5 | 13.85 | 5.6 | Yes | 59 | Petartle 3629. | E | 76.5 | 70 | 90.2 | 53.3 | .656 | .697 | 143.5 | 6.6 | 140 | 4.5 | 42.5 | 5.95 | 6.57 | No | 60 | U.S.A. Exide 6LXR 9/1 | E | 85.5 | 60 (est'd) | 76.5 | 55.8 | .695 | .653 | 126 | 12.0 | 126 | 15.25 | 129 | 16.25 | 7.38 | No | 61 | Exide 6BNXE AL. 4288 | E | 79.5 | 55 | 61.5 | 60.0 | .774 | .629 | 135 | 9.1 | 128 | 11.1 | 127 | 12.25 | 5.9 | No | 63 | C.A.V. Willard 12 ZR.3 4283. | E | 82.75 | 70 | 76.5 | 67.5 | .925 | .816 | 140 | 15.75 | 142 | 11.75 | 140 | 9.60 | 8.58 | yes | 65 | C.A.V. Willard 12 ZR.2 4283. | E | 66.5 | 48 | 47.0 | 43.4 | .707 | .652 | 127.5 | 9.1 | 135 | 9.0 | 139 | 7.80 | 4.6 | yes EFC. | ||