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Royal batteries uses specially alloyed calcium-lead, which leads to extrememly low levels of "electrolyte decrease". Therefore there is no need to supplement distilled water if the charging system remains error-free.
Special liquid-gas separators keeps the electrolyte inside. An electrolyte is any substance containing free ions that behaves as an electrically conductive medium. These separators are also used between the positive and negative plates of a lead acid battery to prevent a short circuit through physical contact.
No filler caps are required therefore there is no electrolyte contamination, overwatering or damage in use. Unique wrought lead-calcium grid design means less internal corrosion and efficient current conductivity for more power and longer life. It also cuts gassing, resists overcharge,heat and thermal runaway. 

• Batteries should be stored in cool, dry (27 oC) places and out of direct sunlight (make sure the battery is fully charged)

• Delkor Royal batteries are tightly sealed to prevent acid leakage. However, tilting the battery to an angle of 45 degrees can cause acid to leak through the vents on the sides. Therefore, batteries should always be stored in their upright positions. Prevent placing any aqueous or solid (i.e. conductors) bodies on top of the battery.

• UN2794 “United Nations Committee of Experts on transport of dangererous goods defines the batteries as wet, filled with acid and electric storage.

• It is extremely dangerous to use tools, such as hammers, on the battery terminals when connecting cables to the mounted battery.

• When storing the battery for long periods of time, check the voltage of the battery every 6 months. If the voltage (OCV) drops below 12.5V, recharge the battery before placing it back in storage.

• Check the hydrometer periodically on stored batteries. If 1 or 2 of the indicators appear black, immediately recharge the respective lot.