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Canon EOS 40D Date and Time Battery Replacement - iFixit Repair Guide
Amazon.com : Synergy Digital Camera Battery, Compatible with Canon EOS 40D Digital Camera Battery Lithium-Ion (1500 mAh) - Replacement for Canon BP-511 Battery : Electronics
Canon EOS 40D Date and Time Battery Replacement - iFixit Repair Guide
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Canon BG-E2 Battery Grip-More Power And Grip For Your Canon 50D, 40D..