Checking the electrolyte level in the battery
Attention: Do not look into the battery using a source of open flame. Possible battery explosion!
The electrolyte level in the battery must be between the minimum and maximum level marks (see arrows).
If the electrolyte level in the battery cannot be determined visually, the covers of the various cells must be unscrewed. The normal electrolyte level should be 6 mm above the plates, including separators. If there is an electrolyte level mark, then the level of the tested electrolyte should be adjusted to this mark.
Caution: Use only distilled water to restore the electrolyte level.
If the electrolyte level or separators in various elements are not visible with the covers removed, add distilled water to a level where: 1 - air pressure channel, 2 - air cushion.
Batteries with high electrolyte levels may boil over when charged very strongly (in hot weather). Insufficient electrolyte levels will shorten battery life.
The density of the electrolyte along with the voltage measurement gives an accurate indication of the state of charge of the battery. An inexpensive hydrometer is suitable for checking the density. The higher the density (concentration) electrolyte in the battery, the higher the float density meter floats. The value of the density of the electrolyte can be read on the scale of the device either in the form of units of density or in degrees Baum (Baume degrers) (+Be). In this case, the following electrolyte density values can be obtained.
Battery level | Zones with normal climatic conditions | |
bohm degrees | g/ml | |
Completely discharged battery | 16 | 1,12 |
Semi-charged battery | 24 | 1,2 |
Fully charged battery | 32 | 1,26 |
Note: In batteries with electrolyte draining cell necks, insert the hydrometer through the three-cell membrane and collect electrolyte.
Cleaning the battery terminals
General vehicle maintenance also includes cleaning the battery terminals and connectors, then applying an acid-resistant grease such as Vaseline to the cleaned parts.
Battery conservation
An unused battery will eventually discharge itself. If the car will not be used for some time, the following measures must be taken.
Check the state of charge of the battery, recharge it if necessary.
Disconnect the ground wire from the battery so that it is not discharged to permanent consumers of electricity, such as an electric clock.
Recharge the battery after three months.
Warning: Depending on the life of the battery, the degree of contamination can be checked more often. Do not leave the battery uncharged as permanent defects may appear on its plates.