The moment you put a case on your device, compatibility with available docks can suddenly drop to 0. Even with a naked device, docks can be problems because of availability early on and price. $20+ for a dock is expensive enough as it is, and if you want one in more than one location, it can really make a dent in your wallet. 

Since I'm currently using a device that has both an extended battery and a case on it, official docks are way past being compatible with it. I messed around with some different designs for an easy-to-make case-friendly dock and eventually came up with a DIY version that uses ground (sleeping) pads as the main material to easily and quickly create cheap docks – as many as you need. 

Check out the video for a tutorial for making such a dock, and keep in mind that you can make these as fancy as you'd want. I'm not too worried about looks on such things, so the least DIY-looking one I've made is a car holder for a friend who has the same phone and case. It uses plastic on both the front and back as well as Sugru around the edges to hide as much of the ground pad material as possible. It also uses a cheap windshield mount attached on the back to make it flexible in the car.

Another use for such a dock is to attach a tripod nut to one, and suddenly you have your own tripod mount for your device. I've done that too, and if you hit the jump you'll find photos of both that one, my desktop dock, and the car holder I made for my friend. 

Desk-dock

R-holder

Sii-tripod-1

Sii-tripod-2