I think everyone should have one of these. Beautiful simplicity. Feels solid. Battery lasts forever, on/off, voltage(you get what you get). This is a take anywhere inexpensive hard knock PV. A great backup. A lot of bang for your buck.

What is it?
Nice. And I'm glad it's working for you. I like the fact that joye is making swappable battery mods. Wasn't fond of the proprietary connector idea though. Particularly since they used or invented the now nearly standard 510 connector. Overall it looks like a decent APV with 5-click protection and an optional PWM regulation.
Which connector is on this one?
I'm with you oxygen, I have several. I've now picked up a few new toys I like better, but this is my backup. It's also the device that let me actually stop smoking cigarettes. For $20 you can't go wrong. The v2 head is the better by far though, I think it's like 12$ and I've seen them offered with the v2 head in the same price range 20-25$. I've had an aw imr 3100 last for a full 2 days no problem also. Oh well you can tell, I'm a fan this device with a ego mega dual coil carto is the ultimate no muss,no fuss go all day vape machine. But I agree, everyone should have one! Or two
Btw you can tell the v2 controller from the original by the finish, it's kind of satiny, while the regular controller is straight stainless color.
I ordered some last night. I don't use the fuse so hopefully they work okay.