The MuRata SR44W watch battery is a suitable replacement AG13 battery for your watch or other portable devices. This silver oxide button cell provides a reliable high energy density for long term use. In addition to the long battery life, the MuRata SR44W also offers a stable discharge that will maintain your electronic device's performance levels throughout the lifespan of the battery. The MuRata SR44W button cell battery is sold by the piece. When placing an order, one unit purchased is equal to one battery. Order of five units or more will be packaged in tear strips of five. The MuRata SR44W, also known as a size 303/357 battery, features Sony's superior technology and engineering for a reliable power source from a brand we trust.