So after couple days of test... I have to say again that I am VERY impressed! After an average day of use (7 AM to 8 PM) it's only down to 80%. With the stock? 40% at best.
Now an update on the case that would fit with this battery cover....
I was at Fry's this evening (my candy store) and I was browsing around. I decided to go to the cellphone cases section and try my luck.
This is what I found:
http://www.caselogic.com/vertical_le...modelid=101934 for $20.
To my surprise, it's actually a very NICE fit. Snug and a bit tight but after some uses it'll lose up a bit and it'll be a perfect fit. Even has open on the bottom so you can plug it in while it's in the case. It has a magnetic flip so it's very easy to access.
I attached some photos of the case with the phone in there with the 3000 mAh battery cover. I had to admit it is a little tight fit but after couple days I am sure it'll lose up enough since it's leather.
So for those who are interested...