I think you mean 20 amps.
On a regulated mod you calculate the amps from the set watts and remaining battery voltage.
66 (60w + 10% to account for device inefficiency) / 3.2v = 20.625 amps. In both series and parallel mods that can be divided with the number of batteries for amp draw per battery.
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Yep, 20A. I changed it. Good catch!