Mine went 4 days between charges when I first got it, and I never let it run down to 0. Now it's about 1.5 days... but the power is not the same, even adjusting, it FEELS like it's wearing out... it's not dead yet tho, but it's not as good as it was when new. I really do love them, so got another one, and I will keep replacing it. But they are disposable because you can't change out the battery.
You have 19 devices so I assume you were not vaping the MVP exclusively and in two months you now have less than 1/2 the battery life? Either you have a defective MVP or something else is wrong there. I don't care how "rough" you are on stuff.