Warning! Be aware that the battery contains a sulfuric acid solution (electrolyte) - an aggressive highly toxic substance that corrodes skin, clothes and causes severe corrosion and oxidation of most metals. In case of contact with sulfuric acid, wash the affected areas with plenty of water. If sulfuric acid gets into your eyes, seek medical attention immediately.
When charging the battery (by car or indoors) oxygen and hydrogen are released. The most intense gases are released at the final stage of battery charging, the amount of gas released is proportional to the value of the charging current.
Oxygen and hydrogen mix at the surface of the plates and form an explosive mixture.
The slightest spark from a lit cigarette or from a match that has just gone out is enough to cause an explosion. This destroys the battery, and sulfuric acid is thrown out. Nearby people may be injured by shrapnel from the battery case or splashes of sulfuric acid. The latter are especially dangerous if they get into the eyes, on the skin of the face or hands. In addition, clothes are damaged.
Switch off all electrical consumers before disconnecting or connecting the battery.
When charging the battery indoors, be sure to turn off the charger before disconnecting or connecting the battery.
Do not place metal objects on the surface of the battery that may cause a short circuit between the battery terminals.
Do not bring naked flames, blowtorches, gas burners, lighted cigarettes or matches near the battery.