The package arrived yesterday and I am eager to open it. To my surprise the product packaging was neat, which is amazing for such a type of product. The charger supplied has an LED that indicates the battery charge state which is very convenient. I installed the new battery in my S2 and it is now more than 15 hours as the battery holds, I'm at 45% with normal use (SMS, internet, games). My old battery was more even half a day ...
I therefore strongly recommends this product for those who are tired of having to connect their smartphone every 2 hours.