I bought the regular size with 4 batteries. I also ordered the Pila charger based on recommendations posted on this thread.
Good choices. One, you can never have too many batteries. I'm not disciplined enough to throw a spent battery right on the charger, so if I'm not up on it, I could end up with no charged batteries. That happened to me once when I started vaping with the little cig-alike batteries that only last 2-3 hours. I panicked during a nicotine withdrawal and bought a pack of my old analogs. Thank goodness they tasted like crap and I only smoked a couple before my batteries were recharged again. Haven't had a cig since.
I got the Pila charger when I got my Silver Bullet and BB. They use the 14500 and 18650 batteries, and I have 3 of each in IMR type. The Pila uses a unique charging algorhythm that some believe can prolong the life of batteries longterm, and I choose to believe that. From what I've read, they also charge in half the time that most of the other chargers do.
My next mod will probably be a Provari. Since the SB already uses 18650's, I'll probably go with the regular size with the extension, just to keep the different kinds of batteries I use to a minimum. A white one in the new color group has my name already engraved on it.
