Electrolyte density at 250°С, g/cm3
climatic region (average monthly air temperature in January,°С) | Season | Fully charged battery | Battery low | |
by 25% | by 50% | |||
Very cold (-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 (-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 (-15 to +4) | All year round | 1,23 | 1,19 | 1,15 |
If the battery fails in operation, as well as during its maintenance, it is necessary to check the discharge of the battery with a rechargeable hydrometer. At the same time, it is necessary to measure the electrolyte temperature in order to take into account the temperature correction to the hydrometer readings indicated in Table. Temperature correction to hydrometer readings when electrolyte density changes. At an electrolyte temperature above 300°C, the correction value is added to the actual reading of the hydrometer. If the electrolyte temperature is below 200°C, then the correction value is subtracted accordingly. When the electrolyte temperature is between 20–300°C, no temperature correction is applied.
1. After determining the density of the electrolyte in each cell of the battery, the degree of its discharge is established according to the table Electrolyte density at 250°C, g / cm3. A battery discharged by more than 25% in winter and more than 50% in summer should be removed from the vehicle and recharged.
2. When measuring density, be careful not to drop drops of electrolyte containing sulfuric acid on the surface of the battery, body and other parts from the pipette, which causes corrosion, current leakage, etc.
3. To avoid incorrect results, do not measure the density of the electrolyte:
- if its level does not correspond to the norm;
- if the electrolyte is too hot or cold; the optimum temperature for density measurement is 15–270°С;
- after adding distilled water (wait until the electrolyte is mixed); if the battery is low, this may even take several hours;
- after several starts (it is necessary to wait for a uniform density of the electrolyte in the battery cell to be established);
- at "boiling" electrolyte (you should wait until the bubbles in the electrolyte collected in the hydrometer pipette rise to the surface).