I had one similar to that. I don't think it's worth it. It gets hot when it charges and it doesn't feel like I'm getting full extended battery cause charging and using your phone cuts the battery imo. I'd just get a regular extended battery. I have this case it's expensive but I like the size and it does add extra battery. It's uNu Unity Samsung Galaxy S4 Battery Case [Black/Silver] - External ... http://www.amazon.com/dp/B00GBHRHHK/..._GvRjtb1C8GNQN
Other than that I was using the hyperion 7200 mah battery for awhile. But the unu is my favorite at the moment because of the size
Sent from my SPH-L720 using xda app-developers app
Currently: Sprint Samsung Galaxy S4 - Sac's Rom
Previous: Htc evo 4g lte, Samsung galaxy s2, Htc Hero, Samsung Moment.