This is a genuine battery for Sony Xperia U ST25i BA600. It is compatible with Sony Xperia ST25i and U models. The battery has a capacity of 1290mAh, making it a reliable option for powering your phone. It is a type of internal battery that is designed to fit perfectly in your phone. This battery is perfect for anyone looking to replace their old or damaged battery. With this genuine battery, you can ensure that your phone will stay powered for longer.