It will fit inside as I am running this exact setup. With one catch; the extended battery back that comes with the GG battery will not fit under the Seidio case, nor will most any other as the Seidio has a unique shape to it. HOWEVER!! You could do what I did. I bought another stock phone back off ebay and dremmeled out a square in it so that the battery may poke through. You don't truly need another stock back but I got one just in case I ever wanted to go back to stock battery, sell, etc.. With the GG battery and dremmeled back, the Seidio case will fit like a glove. It also looks nice through the holes because I have a stock looking blue back. Some people have reported that the extended battery backs cause flash halo's in their pics because of the added depth and reflection. Keeping a stock back in place avoids this too.
So the GG battery won't fit inside the Seidio extended door? I don't care about the GG cover and will use the Seidio cover if it works. Just trying to clarify that I only want to use the GG battery.
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