The ER 34615 PHR4 lithium battery, manufactured by Eve Battery, features a 3.6V output and is encased in a JST PHR4 socket. It has a capacity of 19000mAh, and is the perfect choice for powering electronics when you need a reliable, long-lasting source of power. It is designed for use in digital devices, and can be used to store energy and/or provide power. The JST PHR4 socket ensures a secure connection, making it a great choice for a variety of applications.