you have to look at the C rating and the MAH together....as combined you get the amount of amps the battery can put out.
example.... a 20c 3000mah lipo is fine for the backdraft, but a 20c 800mah lipo would not.
if you can afford it, i suggest getting 30c 5000mah lipos. you can find them on ebay or hobbyking for about $30 each.