For simplicity's sake, I've made a list
from doing my own research on the ic2 forums, there's compatibility issues with ic2 and 1.5
because of such compatibility issues with 1.5, there's going to be compatibility issues with a couple mods in tekkit
this is also the reason why tekkit lite hasn't been updated yet
Besides, it's fun to play without ic2. The regularity that you get when starting up a tekkit lite world, where you always start ic2 first (you know, making an iron furnace then a macerator) is what this mod pack was created for in the first place.