Canon BG-E6, Digital camera battery grip, Canon, EOS 5D Mark II, Black Canon BG-E6. Product type: Digital camera battery grip, Brand compatibility: Canon, Compatible products: EOS 5D Mark II https://www.the-digital-picture.com/Reviews/Canon-BG-E6-Battery-Grip-Review.aspx The nice thing about Canon DSLRs without a built-in portrait/vertical grip (all non-1-Series bodies at this time) is that they are small and light. The big downside is that it is not comfortable to shoot in portrait/vertical orientation - especially fo... http://photographybay.com/2010/01/14/canon-5d-mark-ii-battery-grips-bg-e6-vs-third-party-grips/ The Canon BG-E6 battery grip serves a couple of different purposes for the 5D Mark II. As the name implies, it holds batteries – either two LP-E6 lithium-ion batteries or 6 AA batteries in the included battery holder. Likewise, the BG-E6 serves as a ...