Do yourself a favor. It will be better to spend the money on two Flight Power or Thunder Power packs than to spend the same money on 3 cheapos that you will be replacing all the time because they can't keep up with the current delivery.

Hikg, depending on the setup, helis can put a very demanding load on batteries. Most guys won't fly a Trex 450 for example on anything less than 18c and most of us run 25C