Does it mean that in RBA mode, this version's capacity will be around 5.5 ml?
I believe, since it is using the mini RBA deck, the liquid capacity should be roughly the same whether it's in rba mode or stock coil mode. May be a slight decrease with the width of the RBA deck but it can't be much.
I did notice that it's going to be coming in black too.
http://sweet-vapes.com/coming-soon/kanger-sub-tank-v2.html
I didn't find anymore information other than it was in their coming soon section
Its the rings who are red on the standard one who is black on the "black" v2 I think
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I think that, since there are colored O-rings (including black) already available, that the "black" subtank will actually be black in color. Plus, when I got my Kbox there was a checkbox on the side of the box that read "Silver" (which was checked) and "Black," so I expect the v2 black subtank is intended to go with the black Kbox. But, just a guess -- haven't seen any actual info on this on the Kanger site.