The Switch Wave 401525 Battery is a 3.7V 90mAh LiPo Lithium Polymer designed for Bluetooth headsets and smartwatches. This rechargeable battery is chemically composed of lithium, making it a reliable power source for various devices. With a compact size and high amp hours, this battery is ideal for powering portable electronics that require a consistent and long-lasting power supply. Perfect for those looking for a versatile and efficient battery solution for their on-the-go devices.