The battery is charged with the plugs turned out with a current equal to 10% of the rated current of the battery. A battery with a capacity of 60 Ah is charged with a current of 6.0 A. Charging is carried out until abundant gas evolution begins and a constant voltage and electrolyte density are reached for 3 hours. The electrolyte density of a battery charged at 25°C should correspond to the data in Table. 10.3 for each climatic region.
When charging the battery, periodically check the temperature of the electrolyte and do not allow it to rise above +40°C. If the temperature reaches +40°C, reduce the charging current by half or interrupt charging and cool the battery down to +27°C.
Charging is stopped when abundant gas evolution begins in all battery cells, and the voltage and density of the electrolyte recorded during the last three measurements (carried out 1 hour after disconnecting the battery), will remain constant.
If at the end of charging the density of the electrolyte (determined taking into account the temperature correction) differs from the value indicated in the table. 10.3, then correct it. With increased density, remove some of the electrolyte and add distilled water. If the density of the electrolyte is below normal, then, after removing it from the cell, add electrolyte of increased density (1.4 g/cm3).
After adjusting the density of the electrolyte, continue charging the battery for another 30 minutes to mix the electrolyte. Then disconnect the battery and after 30 minutes measure the electrolyte level in all cells. If the electrolyte level is below normal, add electrolyte, the density of which corresponds to the given climatic region (see table. 10.3). If the electrolyte level is above normal, remove the excess with a rubber bulb.
Table 10.3 Electrolyte density at 25°C, g/cm3
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