· 【Size Parameters】3.7V 2600mAh 9.62WH lithium batteries, size: 18mm(0.7 inch) diameter x 70mm(2.7 inch), (Note: they are longer than the flat-top batteries, please check the battery size before purchasing)· 【Superior Performance】：Built-in USB-C port, support C-C output, you can charge your cell phone and other devices in case of emergency, easy to charge with the included 2-in-1 USB cable, no need for an additional battery charger (does not support PD fast charging)· 【Widely Uses】：TEMIBATT 3.7V rechargeable batteries are suitable for flashlights, headlamps, toys, remote controls, microphones, radios, bike lights, bluetooth speakers, and other household devices.· 【Safe and Efficient】: TEMIBATT 3.7V battery has built-in safety protection against overcharging, over-discharging, over-current and short-circuit, with 1500+ charging cycles for longer service life, making it an ideal replacement battery for high-frequency equipment.· 【Customer First】email support. We specialize in providing quality power products and quality customer service. (Note: Amazon return windows will close after one month, If you have any problem with battery, please Contact us - in “YOUR ORDER” options click the “contact seller”.)