You may want to order a epower
e-Power or the roughstak (same site). Why did I direct you to this site? Cause I've had nothing but good service from theses guys, and I have gotten 4 of my coworkers started with epowers and they are much happier than the guys that chose to go with the Egos.
Both will work with 510 stuff, but of you want to use Ego stuff you will have to order an adapter