... charged automatically through the headpiece and gas discharges off from battery cover. Battery cover, notch and hole are all airtight. No fluid would ... the hole of the ventilative cover, screw off the cover, take out the washer and Plug, dump the battery about 45 °, inject sulfuric ... the washer,screw down the ventilative cover.Wipe up the electrolyte outside.2,Leave the battery 2-4 hours, for the pole ...