For every other Canon DSLR camera like the 7D, 5D Mark II, 60D, and 5D Mark III you'll need a totally different grip. One good thing about the Rebel series cameras is that they continue to share the same LP-E8 battery type along with the same BG-E8 Battery Grip. A cheap BG-E8 grip for the T2i, T3i, and T4i with decent reviews can be found on Amazon and comes with two extra batteries (Click Here).
T2i, T3i, T4i BG-E8 Grip + 2 LP-E8 Batteries