A:Answer It comes with a new waterproof back door that is deeper to allow for the extended battery. As long as you have the standard waterproof housing, your camera can still be waterproof with this extended battery. However, if your camera was sold with the "dive housing," that one is a little bit different size and the waterproof back door that comes with this battery will not fit. The dive housing was sold with some HERO3 models. You can tell the difference because the dive housing has little metal pieces kind of like screws or rivets in the frame around the lens on the front of the case. If those metal pieces are absent from your waterproof housing (the majority of units), then this WILL work for you.
