Luminous E-Float Battery Electrolyte Level Sensor Connect the DC jack of e-float to the connector available at back panel of Luminous Home UPS. The electrolyte level warning indication on the front panel of Home UPS will glow. Remove all vent plugs of the battery and top-up the empty cells with DM water if necessary Replace any one vent plug with e-float and fix rest of the vent plugs in the remaining cells. The electrolyte level warning indication on the front panel of the Luminous home UPS will go off. Fill DM water in each cell, whenever the electrolyte level warning indication glows on the front panel of Luminous Home UPS