All the hankook batteries that you have bought are wet type. Crack their tops open and you can see the electrolyte for yourself
PLEASE everyone stop referring to these maintenance free as dry batteries.
NOW IF ANYONE ACTUALLY PAYS ATTENTION to the forum - these MF batteries are lead-calcium instead of lead antimony. The lead calcium batteries do not evaporate the electrolyte fast - hence require no top up for about 2 years BUT they require a charging voltage of 14.8 Volts minimum which your average japanese car will not have.
The regular exide (lead antimony) battery you buy will fully charge at 13.8 to 14 volts (your car alternator is regulated at this voltage) - to get a VERY VERY good life out of it - prepare the electrolyte with distilled water (if you are posting on PW I beleive you wish to actually do something with your own hands and not wander off chewing some bubble gum and then buy whatever the battery shop owner pushes)