This can do the job ... even with the 1,300 mAh pack but will be kinda tight for indoors.

[link=http://www.hobby-lobby.com/superzoom_6994_prd1.htm]Zoom[/link]

Your packs are too big for a 30" wingspan 3D plane. Most in that category are indoor F3P style planes. Only 6-7 oz and they carry as light as 2S 250 mAh packs.