The B I G Canon BG-E13 Battery Grip. Good Accessory For Your Canon 6D?
Buy - Canon BG-E22 (BGE22) Battery Grip for the EOS R 31.7MP Full Frame Mirrorless Camera (p/n 3086C006)
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Gloxy GX-E13 Battery Grip for Canon EOS 6D
Canon BG-E13 Battery Grip for EOS 6D: Amazon.co.uk: Electronics & Photo