Which model do I have?

Hi I was wondering if someone could help me figure out exactly what model of phone I have? I used to have an EVO 3D but about a year ago I was having problems with it and took it back to Sprint. The guy there offered to replace it with an "upgrade" which he said was basically the same phone but without the 3D function on the camera. I didn't really need or like the 3D setting that much so I took it and it has been fine but I need to get a new battery for it and can't remember what the phone is called, it isn't written on the phone itself either. The model number is PH44100. It uses the same battery as an EVO 3D but I'm hoping to get an extended battery for it and the extended ones for the EVO don't fit because on this phone the battery kind of slides in from the bottom and the thicker battery will be too big.

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I think that's the EVO Design 4g...

Yup, just looked it up and that's it. Appreciate it.

Are there any extended batteries made to fit this phone or am I just gonna have to stick with the stock one?