The UltraFire BRC 18650 rechargeable Lithium battery is equipped with a protection circuit board (PCB) on the negative pole. The PCB can protect the battery from overcharge， over-discharging， overload and short circuit， which can make the battery safer and longer lifespan. The battery is environment friendly and perfect for super bright flash and other devices. - Voltage: 3.7V - Actual Capacity: 2600mAh - Built-in PCB protection board - Package contains 2 batteries Dimensions: 2.68 in x 0.71 in x 0.71 in (6.8 cm x 1.8 cm x 1.8 cm)<img src="http://112.74.112.28/down/products/610128/610128_000.jpg">