After how many months should water be added to the inverter? Company repeatedly tells but people do not pay attention

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If the water level is low, as indicated by the red mark, it means the time has come to fill the water. But, before pouring water, make sure that you switch off the inverter and power socket and remove the plug from the board. So that there is no accident of any kind. Apart from this, wear gloves while filling distilled water in the battery.