I forgot to mention that I use a 4-cell 3600 mah 30C pack. Nevertheless, the 3-cell pack should give you sufficient power to do most aerobatics comfortably. It's just a little sugglish when hoveringcompared to the 4-cell pack but everything else is OK. I do use a 3-cell 4400 mah 25C pack when I exhaust my two 4-cell packs.