To time to begin with this cover corresponds in no way first the quality of the original cover. Eg you can make with your fingernail scratches in the cover. The cover is increased from a rather soft plastic the true grip in his hand, but significantly less resistant is. The cover fits well on the S4 mini and sits firmly on the back. However, the original cover keeps dust away better. The other day I found it down and an edge is chipped off.
My conclusion on the battery cover are split on one side of the cover is inferior to the quality on the other hand, the grip but higher and the appearance is fine. Only the grip is better in these battery cover Everything else in my opinion worse compared to the original cover.