Spinner batteries are "ego type". These are mostly what people use as far as disposable hardware is concerned. A spinner is a variable voltage battery that can be adjusted from 3.7v to 4.8v by spinning/twisting the dial at the base of the battery. This has practical uses for example a kanger T3 clearomiser has a coil which is 2.5 ohms resistance. At 2.5ohms the volts needed to produce enough vapour is about 4.3. So you just set the battery to 4.3. There are plenty of other "ego type" batteries out there but what confuses someone new to it all is the vendors put their own brand name on them. But they really are all the same but with different power capacities eg: 350 mah, 600 mah, 1000 mah, 1300 mah. A spinner battery is a branded battery from "vision", the company that makes them and other hardware for electric cigarettes.A very good quality battery.