It's construction is somewhat different from normal lead antimony battery, though it's filled like normal lead acid battery but difference in this battery is that it's coming prefilled with electrolyte from company, so hopeful that SG of electrolyte would be accurate till 1.27 and that sulphuric acid used would be 99% pure.
It's caps are also different than normal lead acid battery, caps of this hybrid battery have inner silicon type sealing also preventing unnecessary electrolyte escape and very tiny gas vent hole.