My phone became a tank!
I got the ZeroLemon 9300 mAh battery.
The case is nice and soft, yet hardshell, allowing the card to fit inside.
There is a slight bulge on the back of the phone, where the card resides now.
But it's perfect, the case envelopes the phone perfectly with the card inside, everything fits.
The phone is a power beast now. Best device ever!