It is basically any battery that is being used by the vape kit in order to make the machine work. This battery gives power to the mechanism of the vape kit. Now some batteries are modified according to the vape kit and some of them are in-built within the system of the vape kit.All of the batteries have interchangeable cells and we provide you people with just that at vape batteries UK. We provide you guys with the products that are nothing short of best. The ones which are dominating the market and taking it by storm. Now we are not saying that these products are not available anywhere else, for they can be but what we can tell you guys is that we provide the best possible discounted rates. So why pay more when you can pay less for the same thing. We also guarantee hundred percent authenticity. So, what are you waiting for, go ahead and make your purchase from our UK Vape Store.