thx stephpd, good info. do you know what the issue is with the ST 1.7's on this type of mod? I saw someone else mention the 1.7 in another thread but they didn't say why it was a problem. I use the 1.7's and the boge LR's consistently on my current setup so I don't want to buy something new that wouldn't allow me to continue using them.
That issue is about the switch on the E-Power 14650. The original switch (blue) had complaints from some that it got stuck. It does sit rather low in the case and I can see how that could happen though I've never had that problem. Then they came out with the 2nd gen switch and it fixed the sticky button but it also doesn't always allow folks to use the 1.7's. It just starts blinking and no vapor.
Hopefully the 3rd gen switch will fix both problems.
As to the 18650 I've never seen one and heard it had problems. Even looking today it's still hard to find one. When I bought the 14650 I couldn't find the 18650 anywhere. Seems all vendors had pulled them from the shelves. I've heard they're coming back and maybe some vendors do have them now. I just haven't looked.
But these talks are about the Smoktech E-Power. The one you show is the Ego E-Power. Those are different in that the switch is built into the tube. So if the switch goes bad you'd need to replace the whole thing. In the Smoketech one it is seperate from the tube and save you some money if you need to replace the switch or decide to change the color of the tube. Combined the prices are similar but the switch itself was ~$12 (Tube is ~$8) verses the $24 for the Ego one.