Like all V2 cigs batteries, these offer 4.2 volts which is far higher than your average e-cig battery. Generally the larger a battery is, the higher the capacity. Choose from the mini for neat discrete vaping or the long for all day vaping. Combined with the mini-tank Ex-Blank you have the perfect vape pen and best Shisha Pen available.These batteries are available in five colours, Steel, Pink, Blue, White and Black. KR808D-1 thread.