Guess what I have found out?
NTUC and other supermarkets sell only the Energizer "Max" that is
2x the price of the normal yellow card "Alkaline"..
Hence, Eveready is classified as for "normal" usage, replacing the
Alkaline series. So that's where the supermarkets take advantage
and mark up higher 
Why on earth are they selling the "Max" series when ppl just use
the normal ones? 
Gonna make feedback to them, and ask them abt selling the 1 card of
4 batteries