I am looking for a 11.1v Lipo battery that is the same size as the regular 7.4v 6 cells battery so it can fit on my sprint 2. I've been checking out the cheapbatterypack.com but im not sure about the size, help plz

measure your battery tray, height, length and width. If you stick with the ROAR legal hardcase lipos they're pretty much all going to fit.

A soft case 3s pack should be the same size as a 6 cell pack

There are no roar approved pack that are 11.1v so he obviusly doesnt care about that