So I've been a successful ecig user now for almost a year (Feb2nd is my quit date) and almost the entire time I have been only using ego tanks after picking that after the first month of using cartos. I recently just got a dual coil mod tank, it's amazing! It works great on my Ego battery, but my battery looks tiny compared to the tank. I can't really get a provari and Empire mods are unavailable too. My point is what all batteries can I buy that I can use with this dual coil map tank? I like to keep a backup supply of tanks and attys, I only have 2 650mah and1 1000mah ego batteries. Which brands, or types of batteries would you suggest for this tank mod?