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Amazon.com : Neewer Vertical Multi-Power Battery Grip(replacement for Canon BG-E13) for Canon EOS 6D, uses one or two LP-E6 battery packs or six AA Batteries(Batteries NOT included) : Digital Camera Battery Grips :
Vivitar Battery Power Grip and Two Replacement LP-E6 Battery Pack for – The Teds Store
PowerTrust BG E13 Battery Grip for Canon EOS 6D DSLR Camera Work With LP E6 Battery or 6X AA Batteries|Battery Grips| - AliExpress
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Canon BG-E21 Battery Grip for EOS 6D Mark II with Essential Battery Bundle - Walmart.com