IDK
Test/Review of UltraFire XSL18350 1200mAh (Orange)
They don't look like high drain. Also, if stacked (not advisable for use at all in a mech since Li Ion and not protected) remember that amp limits don't stack...so whatever limit one has applies to the whole stack.
By the usage curve in that link, I wouldn't want to go over 3 amps (11.1 watts @ nominal voltage)
Will check for more info.