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).
The camera bodies are very close in design, but still a bit different. It doesn't seem like you can swap the camera's battery doors (when removed for installing battery grip). For those wondering about the GGS glass protectors working on the Canon T3i / 600D, it doesn't look like a fit. The buttons are close to the same position, but everything is just slightly off. Other accessories such as Batteries, Cards, and Chargers are all the same, so the T3i / 600D should be seamless to drop into any existing Canon T2i workflow...
I was asked by several people to do a review on the Canon 550D / T2i aftermarket battery grips that are found on eBay. I decided it would be best to do a side by side comparison to the real deal OEM Canon BG-E8 battery grip. Here's some video footage I hope helps clear some things up. The video is a bit long, but what's 10 minutes out of your life compared to the $$$ savings if you decide you want to go aftermarket.
The Canon BG-E8 OEM retails for $160.00
LP-E8 Rechargeable OEM retails for $60.00
BG-E8 Grip available from $59.00
LP-E8 Rechargeable from $10.00
(I got the grip + 2 batteries for $69.00)
Ordering normally takes several weeks from overseas. There is never an option for overnight shipping from eBay overseas, so don't expect to place an order the weekend before your next event. The buyer I received mine from on eBay (found here),shipped it to me in just 7 business days after I placed the order. Very very fast for on overseas seller. The box and packaging inside the box is impressive and everything was bubble wrapped or came with a plastic shell cover. It even comes with some very clear, descriptive, instructional manual in different languages. Looks like quality stuff.
The build quality is almost exact. At first I believed these aftermarket grips were coming out of the same factory and just being rebranded (like most things), but in fact there are some differences in design. The color is a bit darker and doesn't match the T2i exactly, but you would never know the difference unless they were side by side. The texture on the grip is a bit different too, but feels the same (non slip). Weight also feels very close, and again, you'd never know unless they were side by side. If you look very very closely, you'll see the buttons are just millimeters off from the OEM, but basically in the same area and laid out just like the OEM.
As you can see, by going aftermarket you can save a ton of money. In fact you can buy almost three sets of grips + batteries compared to going OEM. If you're wondering about the longevity of these products, i've been using aftermarket Grips + Batteries on my 5D Mark II and my Canon 7D without any problems. Of course you do have to order overseas and through eBay for the best deals. Some sellers might not have the best customer service, but if you're looking to grab one from the same person I received mine, check out this link.
Next on the review is comparing the battery life from the OEM vs. Aftermarket. I can already tell you that it's probably going to be exactly the same, so why waste time and just grab them online now for as little as $7.99 US. Check out my article here: http://cheesycam.com/?p=752
Wow, it's been a struggle trying to get a hold of one of these Battery Grips for the Canon EOS 550D a.k.a. T2i. This is the OEM Canon BG-E8 part number which I could not find in stock on Amazon, Adorama, B&H Photo Video. Much props to the guys at Calumet San Francisco for tracking one down in their San Diego store and having it shipped. This grip definitely makes holding the Canon EOS 550D alot easier, especially since it's front heavy from a lens.