This replacement battery has in my opinion a good price / performance ratio. The delivery of this battery does have lasted quite a while, but the trader has its headquarters in UK. I invite this battery as well as the original battery, who was there with my Samsung Galaxy S4 LTE I9506, in my Smartphone myself because I yet could buy no extra extra charger Samsung me. Well, even the original battery is not always recharges to full 100%. And whether the battery power now wears off quickly or slowly, it depends on so many factors: I hear a lot of music with your smartphone? Many videos on YouTube I look at? I Surf the Internet a lot? I write a lot of emails or I ask a lot from those? I write many SMS or WhatsApp messages? I am often in Facebook? Is at my Smartphone constantly active GPS? I photograph a lot, or do I take a lot of videos with your smartphone? Or have I turned off all power-hungry and use my smartphone just only to make phone calls? I have certainly noticed that everyone loses from my two batteries faster performance, the more I use my smartphone. Therefore, I will soon have to buy a third battery with a charger case.