3.7V 3200mAh Lithium Batteries: Diameter: 18mm (0.7 inches), Length: 70mm (2.7 inches). Note: These batteries are longer than flat-top batteries; please check the size before purchasing.
Superior Performance
Built-in USB-C Port: Supports USB-C output, allowing you to charge cell phones and other devices in emergency situations.
Easy to Charge: Compatible with the included 2-in-1 USB cable, no need for additional chargers (PD fast charging not supported).
Widely Used
Suitable for Multiple Devices: NERMK 3.7V rechargeable batteries are perfect for flashlights, headlamps, toys, remote controls, microphones, radios, bike lights, Bluetooth speakers, and other household devices.