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 for lead-acid battery maintenance, charging, and cleaning.
| Identifier | ExFiles\Box 26\2\ Scan061 | |
| Date | 25th April 1917 | |
| -22c- Contd. In other words, it amounts to this:- Always endeavour to keep battery fully charged but do not over-charge unnecessarily. The battery is fully charged when every cell is gassing freely and no further charge need be given under these conditions. It is important to inspect the level of the electrolyte in the cells frequently and maintain this level to cover the plates by 3/16" by the frequent addition of distilled water. Use a syringe type hydrometer to take the densities of the electrolyte in the cells, which should be 1200-1250 when in a fully charged condition and after standing for an hour. If the density is low, remove as much acid as possible by means of the hydrometer and replace with new acid of density 1250. If it can be found convenient to effect this change of acid when the cells are in a partially discharged condition and the electrolyte consequently of smaller density, a proportionately bigger gain in density is secured. As far as possible, arrange to make changes in the electrolyte just previous to charging. Every twelve months, renew acid, but only when battery is fully charged. The top of the battery should always be kept clean, and as far as possible, dry; attention should immediately be given to the least sign of corrosion occurring on the terminals. Keep the terminals and connections lightly greased, clean on their surfaces in contact, and firmly Contd. R.R. 235A.(500 S.D. 'S')(T.S)(D.{John DeLooze - Company Secretary} 408. 25-4-17.) Bm. 2156/13. | ||