I can't think of any standard sized batteries that'll give you more than 2 - 3 hours of constant vaping, and that's probably generous. Any XL's from places like V4L or SI would work as a standard startup kit. I think he'll regret not going bigger later on, at least I did. I'm not into the huge batteries like the LT or PV, but love my kGo 1100 mah's.