Just got my Galaxy S7 edge and figure I would buy a case/battery pack. Here is the unboxing video of the one I found on Amazon.
The 5200 mAh capacity case has 4 leds in the back indicating battery pack in 25% increments. It can be turned on and off by holding the button in the back down. Speaking of the back it also has a nice kickstand for watching videos.
It weighs in at 130 grams or about 4.75 oz
The speaker sounded unimpeded , the edge function and buttons are totally usable. The the earphone plug will now allow a flush right angle ear plug as it looks to be recessed from what I can tell.
The unit sells for $28.00 on Amazon.com