The Samsung Galaxy S3 is a very nice phone but the battery life is kind of sucky. My phone is just over 2 years old and this is the second battery I have purchased for it. The battery that came with the phone petered out after 6 months. This battery was definitely an OEM. It had about a 60% charge when I popped it in the phone and it charged up quickly. So far, it is holding the charge nicely. I am very pleased. Also, shipping was very fast for standard shipping. I think it took 3 or 4 days to arrive. I'm keeping my old battery that still had juice in it, but it would lose 10% or more an hour just sitting idle. I would definitely buy from this company again. A great price for an OEM battery.