got mine in october of last year and it's pretty much dead right now.
do bear in mind though that it has been my one and only device for almost a year and i normally used it till it reached 3.7ish before charging. on average I'd vape at 3.8V. i wasnt very gentle with it, but i wasnt exceptionally rough either,.. i dont think. dropped it only once or twice.
it still works, but it doesnt hold a charge for longer than a 15-20 vapes before it shuts off.
i can and do still use it when sat at my computer with the USB plugged into a charger thingy and it works just fine.
when i realized it was dying i got a portable battery and taped that to the mvp2 and connected with a short usb cable and it works fine,... i just look like I'm sucking on an IED
i paid a full 70 bucks on it and for me it was money well spent. even though I've moved on to mechs I am still tempted to get another at 40 bucks,... that's just silly cheap for what it is.