Say goodbye to your old useless batteries! Here we will recommend you a superb safety protected rechargeable lithium battery! This Ultra Fire BRC 18650 rechargeable lithium battery is designed perfectly. We offer this UltraFire 18650 battery in order to meet customers' different needs. It is precisely engineered and rigorously tested for voltage, capacity, compatibility and safety, which exceeds original mobile battery specifications. This 18650 rechargeable lithium battery are rapidly becoming a very economical way to lower the operating costs of flashlights and some other things. The voltage of this 18650 Ultrafire battery is 3.7V and the capacity is 2400 mAh. The integrated microchip prevents overcharging and lengthens battery life. Ultrafire batteries are really practical. So please be quick to buy this good rechargeable lithium battery.