Before charging, check the electrolyte level, top up with distilled water if necessary.
Never short-circuit the battery. In the event of a short circuit, it heats up and may crack. Do not light the battery with an open flame. Electrolyte (based on sulfuric acid) is a corrosive liquid and should not come into contact with eyes, skin or clothing.
Disconnect the positive wire and ground wire from the battery terminals. When connecting and disconnecting wires, be careful not to cause sparks. Therefore, first turn off all current consumers.
Allow a frozen battery to stand before charging. A charged battery freezes at about -65°C, a half-charged battery freezes at about -30°C, and a discharged battery freezes at about -12°C.
Remove the plugs from the battery and put them on the holes. This will prevent splashes of electrolyte on the varnish, and at the same time, during charging, the resulting gaseous products can escape.
Charge the battery only in a well-ventilated area. When charging the built-in battery, leave the trunk lid open.
Under 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 with a fast charger.
Attention! Fast battery charging should not become a habit! Do not overcharge batteries that are new or have not been used for a long time.
Connect the positive pole (+) battery with the positive pole of the charger, and the negative pole (–) battery with the negative pole of the same device.
During charging, the temperature of the electrolyte should not exceed 55°C, if necessary, interrupt charging or reduce the charging current.
Charge until the brisk gassing of all cells ceases and the voltage and specific gravity of the electrolyte no longer increase, measured three times one hour apart.
After charging, check the electrolyte level, top up with distilled water if necessary. + Check electrolyte density. If the measured density in one cell is less than other values (for example, in five cells the density is 1.26 g/ml, and in one cell it is only 1.18 g/ml), the battery is defective and should be replaced (restore).
Leave the battery for about 20 minutes to completely release gases, then screw in the plugs.
Attention! The engine should not run with the battery disconnected - the electrical system is damaged.