I'm using a Mvp 3.0 pro and i love it. I charge it twice a day if i vape nonstop, but you can charge it from any android phone charger, and you can charge your phone from your mod if your phones dead and your not near a charger. i love itI was looking at the Coolfire and the MVP 3.0 Pro. So you think those would be good upgrades? I really do love innokin quality.