The Tuteby 3.7V ICR18650 2000mAh Lithium Ion Rechargeable Battery is a high-quality, long-lasting power source for a wide range of electronic devices. With a capacity of 2000mAh, this battery is capable of providing a steady stream of power to your device for extended periods of time. The lithium ion technology ensures that the battery can be recharged quickly and efficiently, making it a convenient and reliable choice for all of your power needs. Whether you're using it to power a flashlight, a portable speaker, or any other device, this battery is sure to keep you powered up and on the go.