Electrolyte density at 250°C, g/cm³
| Climate region (average monthly air temperature in January, °C) | Time of year | Fully charged battery | The battery is discharged | |
by 25% | by 50% | |||
Very cold (from -50 to -30) | Winter | 1,30 | 1,26 | 1,22 |
Summer | 1,28 | 1,24 | 1,20 | |
| Cold (from -30 to -15) | All year round | 1,28 | 1,24 | 1,20 |
| Moderate (from -15 to -8) | All year round | 1,28 | 1,24 | 1,20 |
| Warm humid (from 0 to +4) | All year round | 1,23 | 1,19 | 1,15 |
| Hot dry (from -15 to +4) | All year round | 1,23 | 1,19 | 1,15 |
In case of battery failure in operation, as well as during its maintenance, it is necessary to check the discharge of the battery with a battery hydrometer. At the same time, it is necessary to measure the temperature of the electrolyte in order to take into account the temperature correction to the hydrometer readings, indicated in Table. Temperature correction to hydrometer readings when changing the density of the electrolyte. When the electrolyte temperature is above 300°C, the correction value is added to the actual hydrometer reading. If the electrolyte temperature is below 200°C, the correction value is subtracted accordingly. When the electrolyte temperature is within 20–300°C, no temperature correction is applied.
1. After determining the density of the electrolyte in each battery element, the degree of its discharge is determined according to the table Electrolyte density at 250°C, g/cm³. Remove the battery from the vehicle if it is discharged by more than 25% in winter and more than 50% in summer and recharge it.
2. When measuring the density, make sure that drops of electrolyte containing sulfuric acid, which causes corrosion, current leakage, etc., do not fall from the pipette onto the surface of the battery, the body, or other parts.
3. To avoid getting incorrect results, do not measure the density of the electrolyte:
- if its level is not normal;
- if the electrolyte is too hot or cold; optimum temperature for density measurement 15–270°C;
- after adding distilled water (you should wait until the electrolyte is mixed); if the battery is discharged, this may even take several hours;
- after several starts (you need to wait until the electrolyte density in the battery element becomes uniform);
- with "boiling" electrolyte (you should wait until the bubbles in the electrolyte collected in the hydrometer pipette rise to the surface).
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