Before charging, check the electrolyte level and add distilled water if necessary.
Never short-circuit a battery. When short-circuited, it will become hot and may crack. Do not expose the battery to an open flame. Electrolyte (based on sulfuric acid) is a corrosive liquid and should not come into contact with eyes, skin or clothing. If necessary, rinse the area where the electrolyte has come into contact with plenty of water.
Disconnect the positive and ground wires from the battery terminals. When connecting and disconnecting wires, pay attention to avoid sparking. Therefore, first disconnect all current consumers.
Allow the frozen battery to settle before charging. A charged battery freezes at approximately -65°C, a half-charged battery at approximately -30°C, and a discharged battery at approximately -12°C.
Unscrew the plugs from the battery and place them on the holes. This will prevent electrolyte from splashing onto the varnish, and at the same time, the resulting gaseous products will be able to evaporate during charging.
Charge the battery only in a well-ventilated area. When charging a built-in battery, leave the trunk lid open.
During normal charging, the charging current is 10% of the capacity (for a battery with a capacity of 74 Ah, therefore about 7.4 A).
The battery can also be charged using a fast charger.
Warning! Fast charging of the battery should not become a habit! Do not fast charge new batteries or batteries that have not been used for a long time.
Connect the positive terminal (+) of the battery to the positive terminal of the charger, and the negative terminal (-) of the battery to the negative terminal of the same charger.
During charging, the electrolyte temperature should not exceed 55°C, if necessary, interrupt charging or reduce the charging current.
Charge until vigorous gas evolution in all cells ceases and there is no further increase in voltage or specific gravity of the electrolyte, measured three times at one-hour intervals.
After charging, check the electrolyte level, add distilled water if necessary. + Check the density of the electrolyte. If the measured density in one cell is less than the other values (for example, in five cells the density is 1.26 g / ml, and in one cell - only 1.18 g / ml), then the battery is faulty and should be replaced (restore).
Leave the battery for about 20 minutes to allow all the gases to escape, then screw the caps back on.
Warning! The engine must not be running with the battery disconnected – the electrical system will be damaged.