Personally, I would recommend you NOT use the standard battery cover as it really does seem to "stress" the internals of the phone. I use the Verizon Case/Holster combination. Contrary to what others have written here, it is NOT designed for the Extended Battery and makes it fit funky in the Case and harder to install/remove from the Holster. So, I have stopped using any battery cover at all. The Verizon Case provides nice structural support and the Extended battery does not interfere at all. I am not familiar with the case you are using, but if it provides some structural support, you might consider not using any Battery Cover.