Mandatory for big hands

This is not primarily to have an extra battery I took this grip (although interesting for very long walks or video that is energy intensive) but for a better grip. Indeed, I find the 550d too light and too small for my paws. Now with this grip, I find the balanced device, and more with a little heavy lens. Excellent as dual controls (triggers, magnifying glass - and + AV and wheel) on the grip for portrait position. So, it is always on my case. By cons not easy to find a bag (which is not backpack) that can accommodate a housing grip +.