mah is the volume of energy stored, like the size of a gas tank
11.1 volt and 3s is the pack has 3 cells at 3.7v a cell
29-30c is probably 25-30c, c is the measurement of available current. in this case it is 25 amps per 1000mah cont, 30 amps per 1000mah for a limited time. 2200mah 25c is 55 amp continuous available,,,, in a perfect world, on a perfect day. the only real factor other than damage or age is temperature it's operating in will limit that part.
don't know about your heli, but that's the basics of lipos and what they say on them