I talked about these batteries a little while back when I placed my order on them. I've been using China shipped aftermarket batteries for years on my Canon 5D Mark II & Canon 7D (same batteries). I use aftermarket battery grips for both of those cameras also. Since i've been using them with absolutely no problems, it was a very easy decision for me to try out the 550D / T2i batteries coming out of China. I'm very happy with them. They work like normal Canon OEM batteries. They seem to last just as long, and unlike my other batteries, I can charge these on the Canon OEM charger. They also display the battery life indicator on the Canon EOS 550D / T2i. With shipping you can get them for as little as $10 bucks each. I was a little skeptical at first, but the T2i videos seem to blend in seamlessly along with the other cameras and is now seeing just as much, if not more, use during the gigs. It's never been used for any photography, but as a third video camera, it rocks! These batteries are a big help on long jobs. These aftermarket batteries for the Canon EOS 550D / T2i rock! You can purchase the batteries by clicking here.
Updated: Here's the new link for a seller that's selling the exact same batteries I use.
click image to purchase aftermarket batteries for the Canon EOS 550D / T2i