Not sure what peak amps are, but i only put in about 600mah per pack after 3- 10 min flights in my eurosport using dual 2s1p 2300mah A123 packs.

If your worried about amperage draw, run dual 2s1p A123's. No regulator needed (as long as your servo's can handle 6v).. And 5 minute balance charging times per battery at the field are nice