My CP mini "says" 8A maximum input current. But I'll hazard to assume that it's actually more like 10A, in line with its max output current spec. Even so, all this means is that you'd need a 10A or greater (max continuous discharge) battery. No matter what resistance you slap on it. What happens on the atomizer side of the circuit (chip to atty) is of no consequence when selecting batteries, except perhaps to help you select just which >10A battery might give you maximal performance. Eg, if you tend to build and use lower Ohm atties close to the CPmini's lower limit and with the device set at or near its 30w max, then perhaps a more robust battery, like a 20A Samsung 25r, will actually yield a longer useful duty cycle between charges than say a 10A Panasonic18650BD, even though the Panny boasts a 3200mah capacity versus the 2500mah of the Sammy.