Genuine replacement part. This battery is an official Samsung replacement, so you can be sure of 100% compatibility with your device. Same capacity as original battery. The Samsung EB-L1G6LLUCSTD is the same battery as comes with your phone, so it has the same capacity. This means whether you're looking to replace an old battery or simply want a spare, you can be confident of getting the same battery life out of your phone as you originally experienced.