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).
Instructions on battery care for cars parked for long periods, including bulb specifications and trickle charging.
| Identifier | ExFiles\Box 26\2\ Scan291 | |
| Date | 16th May 1928 guessed | |
| -3- Contd. be parked for long periods in the dark, small consumption side lamp bulbs should be used, i.e. BAS.LC. 12/14 Volt, 6 watts only. Where a suitable direct current supply is available we recommend that it be made a rule to leave the battery on charge at "trickle" rate (about ½ ampere) when the car is in the garage, as such a procedure will assist in keeping the battery in a thoroughly good condition. Care should be taken that the charging circuit be electrically sound and properly protected by a fuse. EFC. | ||