2 Pack 3.7 Volt 18650 Rechargeable Battery High Capacity 9900 mAh Package Includes: 2 pack button top batteries Widely Compatible: 3.7 volt 18650 rechargeable battery for flashlights, headlights, digital cameras, doorbells,toys, radios, speakers, Electronic Device. this 3.7v battery is highly portable, making it convenient for travel, camping trips Product Size: 67*18*18mm/2.63*0.7*0.7inch; it's a 3.7 volt rechargeable battery BUTTON TOP, please check carefully before purchasing Multiple Protections: This 3.7v 18650 battery features six types of protection, including temperature, short circuit, overcharge, and overcurrent protection. These features ensure the battery remains stable and your device stays protected at all times.Please fully charge the battery before the first use, the battery will work better. Charge up to 1000 times without frequent battery changes Thank you for viewing our 2 Pack 3.7 Volt 18650 Rechargeable Battery High Capacity 9900 mAh.