The advertised capacity of a battery is based on a particular C-Rate provided in a battery’s specification (typically referred to as the standard or nominal discharge rate). The amp draw at this C-Rate is generally much less than max amp draw given by the C-Rating. For example, the LG HE4 battery specification states that its advertised 2500 mAh capacity is at a C rate (500 mA). Since battery capacity decreases as current draw increases, one should not expect a battery to last at the advertised capacity when drawing current above the standard discharge rate. For example, testing has shown that an LG HE4 discharged at 20 A reduces the battery capacity by at least 10%.