Oh so you mean something like this:

http://www.amazon.com/T-Mobile-Cellular-MetroPCS-18-Month-Warranty/dp/B00CBTTA4A/ref=sr_1_1?s=apparel&ie=UTF8&qid=1452886606&sr=8-1&keywords=samsung+galaxy+s4+battery+anker

That's better that buying one that claims to be a Samsung OEM?