Thanks a lot everyone.
I use the usb charging cable that came with it & my phone charger as the MVP2 didn't come with a charger.
It wasn't by any fans. Had it in a biscuit tin lid. Slightly sloped into the tin as the charger doesn't fit in it as well.
It charged from flat (usually around 3.6 or 3.7) to 4.1 (about 2 or so hours). Normally finishes at 4.2 but lately it goes up to 4.3 before it's finished then reads back at 4.2 when finished. Maybe that's was a sign that the mvp is faulty? I had used it as a pass
through while charging about 5 separate times without any vibration. At those times I didn't feel any heat from the MVP & very minimal heat from the charger. In the past the charger has gotten pretty warm - but may have been another charger. All seemed to be good until until I checked it that last time.
Had someone measure the outlet voltage & it read at some number when turned off instead of 0. I don't know if that could have anything to do with it since it gives the correct output when turned on. Could it have been the outlet?
So I'll order a new mvp. Can I use this one now until it runs flat (as it was partially charged) before
throwing it away? Or is it dangerous using it even while it's not charging?