HTC Evo 3D extended battery case

So, I like cellphone cases. I like to protect my cellphone. It's all and well if you use the default battery size. For extended batteries, it's really hard to find cases that are made for them. 3rd party extended batteries differ in shape and size.

I had a HTC Evo previously and I shelled out the money for a Sedio extended battery plus case, but they're expensive.

With my Evo 3D, I decided to get a cheaper extended battery. It's this kind: http://www.amazon.com/Trexcell-3500mah-Extended-Ba