Warning. When servicing the battery, you must follow the safety regulations.
To get the job done you will need:
- hydrometer;
- voltmeter.
Check sequence
1. Disconnect both wire terminals from the battery terminals.
2. We measure the voltage at the battery terminals with a voltmeter. Comparing the result with the values indicated in the table, we determine the battery charge.
Table 13.1
Voltage at battery terminals, V | Battery charge level, % |
12,6 12,4 12,2 12,0 |
100 75 50 25 |
3. If the upper battery mounting bar is installed, it must be removed.
4. We turn out six battery filler plugs.
5. Using a hydrometer bulb, we select part of the electrolyte into the flask of the device and, without removing the nose of the flask from the filler hole of the battery, we determine the density of the electrolyte in each bank of the battery using the floats. Each float is marked with the minimum density at which it floats.
Note. In a hydrometer with one float, the density of the electrolyte is determined on a scale printed on the float and depends on the depth of its immersion.
The density of the electrolyte with a fully charged battery should be close to that indicated in Table. 13.2 in accordance with the climatic zone of operation of the vehicle.
When taking hydrometer readings, it is necessary to take into account the temperature correction. With a decrease in the electrolyte temperature by one degree, the battery capacity decreases by 1-2%.
Table 13.2
Climatic conditions for battery operation | Electrolyte density (at +25°C), g/cm.cub. | |||
poured into the battery when refueling | in a battery in which the state of charge of the batteries | |||
100% | 75% | 50% | ||
Hot climate (all year round) Temperate climate (all year round) cold climate (all year round) Very cold: winter in summer |
1,23 1,25 1,27 1,29 1,25 |
1,25 1,27 1,29 1,31 1,27 |
1,21 1,23 1,25 1,27 1,23 |
1,17 1,19 1,21 1,23 1,19 |