The Canon LP-E8 Battery is the power source for several iterations of Canon EOS Rebel models inclusing the T2i, T3i, T4i and T5i.
These are very compact Li-ion batteries with a decent shot rating for their size. It's always good to have at least one spare battery with you, especially if you are shooting video.
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Where you buy your gear matters. You expect to get what you ordered and you want to pay a low price for it. The retailers I recommend below are the ones I trust for my own purchases. Get your Canon LP-E8 Battery now from:B&H Photo