Well you could buy the SE and then you would know you are getting 3.7v. Or you could ask them if their other Riva 510 kits are the new 3.7v style. No other way to tell really. The engraved Riva logo on the outside of the threaded part of the battery got bigger but that was not exactly in sync with the power change (logo got bigger first, then power change).
And just FYI - given where you live and the difficulty of getting ecig stuff, you might consider getting a 3.7v mod like the Indulgence (should be at the Eastmall store). Mods take standard industrial protected or AW IMR lithium ion batteries (they usually need to ones with the button end on the positive terminal, not the flat end). Another mod is the Bauway 510-N which I think you may find at Bogetech in China?
And for any of these, get drip tip, plenty of spare atomizers, spare charger if it's a proprietary charger (Indulgence may need you to buy the batteries and standard charger elsewhere), and I recommend cartomizers (Boge are most popular for 510-threaded devices) and you need eliquid (I think Boges work best with thin liquids very low on VG like PG w/ 10-20% VG or 0%)