case with built-in battery for S6?

[donutss]

Hello everybody.

Just bought a new Galaxy S6, and my main problem is still the battery.

I would like to buy a case with built-in battery. However, the comparison of the individual is very difficult. Now I'd like to ask you how to select a good battery case?

 

[bkeaver]

Zero lemon makes one and has a 3500mAh battery. I believe you can find it on amazon .com