It would depend on what
mod, too. A .91Ω coil at full charge 4.2 volts makes 19.3 watts and draws 4.6 amps from the battery on a mech
mod. On a regulated mod, it might be different. To find max amps on a regulated: [minimum battery voltage (usually about 3.2) x set watts] x 1.05 = max amp draw. The 25R is a 20 amp CDR and, in general, on a regulated mod it's good for about 60 watts or so. The AWT is a rewrapped battery, and there is no way to tell what actual battery is under the wrap, so no opinion. In general, a .91 coil is not a problem in most attys and on most mods. I will build a one battery mech down to .4 if I'm feeling brave and on a regulated it doesn't matter much so long as it falls within the mod's ability to fire it.