The Ccell M4 battery is a high-quality rechargeable battery designed for use with thick oil and features a standard 510 thread for easy connection. This pack of 5 batteries is compatible with a C type charger, making it a convenient and reliable choice for powering various devices in the sound and vision category. With a voltage of 3.7V and a Li-Ion chemical composition, these coin cell/button batteries offer long-lasting performance for extended use. Trust in the Ccell brand for top-notch quality and efficiency in your electronic devices.