2200mAh packs are what Parkzone recommends, though I would not purchase their 15C packs.

Instead make up an adapter and purchase 20C 2200mAh packs, that you will be able to later use on other planes as well.

There are some amazing bargains to be had, such as the Hobby City Flightmax 20-25C LiPo's for $18.00/ea!