The green light on mine doesn't go off when it reaches 4.2 volts. Edit- You're better off using a lower rated wall adapter for the usb-usb micro plug, rather than using your computer. It will charge it, but if it ever fires, I'm sure it will exceed the ~1 Amp rating of a computer USB port. Plus, a USB cable is a USB cable. You're not going to be pulling over 3 Amps with an MVP in passthrough/bypass, so any usb-usb micro cable will be fine.
After owning one, and not just playing around with one for extended periods of time, I have a few complaints about MVP, but the majority are just, "meh, it could be better," complaints.
1. I constantly have to pull cartomizer contacts down to make contact. I could have just taken a tank off and put it back on, and I have to pull the contact a tad. I don't know why the well has to be so deep.
2. I can only access the menu once while on charger? Why even let me access menu?
3. Only one sized beauty ring that came with it. The threads could be a little higher on the MVP for it, but that would probably inhibit ego threaded atomizers from accessing the extremely deep well for firing pin.
4. Why doesn't it come with covers for the input and output plugs? I have to search for something to prevent things from getting in one of the most essential parts of the PV to keep safe.
5. Menu buttons rattle a tad. They made the fire button probably the stiffest on the market. Why not make the menu buttons stiff?
6. I got a version 2, right before they altered the output button to sit flush with the bottom...so I can't really complain about that.
7. I'd like to be able to go up or down when selecting power or energy outputs, but that really isn't a problem..even though if I'm in voltage mode, just because I click up, it shouldn't go to wattage mode..
8. I can see how some people won't like the stiffness of the firing button, but I see this as a pro. I hate turning the button off to put it in my pocket. With the mvp, I don't have to do so...just listing it because I'm sure others will have that complaint..and feeling the need to ..... more