1. Removing the upper cap is very troublesome. Who uses the shell permanently this will not notice or will not interfere. I personally use the spare battery only when I have a long day / Travel / dates in front of me, where I have no loading facility. So I use from time to time also a normal case. When you then change always afraid to wreck the upper frame because it's very difficult.
2. I find it a shame that one has the Höle not provided with an iphone charger socket, so you have to always go first and charge with Micro USB.
The envelope when you're looking over this departed two points highly recommended.