Attention: do not bridge the AB contacts with each other, because. while it heats up and may crack. Do not use open fire near the AB. Battery electrolyte is highly corrosive and should not come into contact with eyes, skin or clothing. If this does happen, then the electrolyte must be washed off with plenty of water.
Before charging, you need to disconnect the wires from the battery. The negative wire is disconnected first.
A frozen battery must be thawed before charging. A charged battery freezes at a temperature of about -65°C, a half-charged battery freezes at a temperature of about -30°C, and a discharged battery freezes at a temperature of about -12°C.
A battery that has been in a discharged state for a long time cannot be fully charged or charged at all with a conventional charger. In this case, you need to use an electronic charger, because. with a small charge current, the battery does not heat up so much.
Before charging, you need to check the voltage of the battery in the disconnected state.
Unscrew the plugs from the battery and put them over the holes so that the electrolyte does not splash on the paintwork during the charging process, when gases come out of the battery.
Charge the battery only in a well ventilated area. If the battery is charging on the car, then open the trunk.
During normal charging, the charging current is about 10% of the battery capacity (for battery with a capacity of 50 Ah - about 5 A). Typically, the charging time is about 10 hours.
Connect the wires of the charger to the battery, observing the polarity of the connection.
The temperature of the electrolyte during charging should not exceed + 55°C, if necessary, stop charging or reduce the charging current.
Continue charging until all the cans begin to actively release gases (AB «boils») and at the last three measurements, separated by intervals of 1 hour, the density of the electrolyte and the voltage do not increase.
Check the electrolyte level after charging and top up with distilled water if necessary.
Check electrolyte density. If in one of the jars the density of the electrolyte is very different from the others (for example, in 5 jars the density is 1.26 g / ml, and in one jar - 1.18 g / ml), then the battery is faulty and needs to be replaced.
Give the AB 20 minutes to stop the release of gases, then tighten the caps of the jars.
Attention: The engine must not run with the battery disconnected, as otherwise, parts of the electrical system will be damaged.