BM Premium 2-Pack of LP-E8 Batteries for Canon EOS Rebel T2i, T3i, T4i – Big Mike's Electronics
BM Premium 2-Pack of LP-E8 Batteries and Battery Charger for Canon EOS Rebel T2i, T3i, T4i, T5i, EOS 550D, EOS 600D, EOS 650D, EOS 700D Cameras - Walmart.com
Canon T3i DSLR Camera with 18-55mm Lens 5169B003 - B&H Photo
Canon EOS Rebel T3i Battery Replacement - iFixit Repair Guide