So, even though I just got my first e-cig yesterday (KangerTech EvoD), the mod bug is already gnawing away at me. I am already looking into getting a Aspire K1 tank and bvc, but now I am looking at a bigger battery. The battery in this EvoD has been doing good enough for me. I am just now charging it after using it for a day and a half, but thinking about upgrading it just for the heck of it and maybe I won't always have access to a charger for it. What do you guys suggest? I don't have a huge budget to work with though.