http://www.hobbyking.com/hobbyking/..._2650mAh_3S_40C_Lipo_Pack_USA_Warehouse_.html i got 2 of these, http://www.hobbyking.com/hobbyking/..._4000mAh_3S_40C_Lipo_Pack_USA_Warehouse_.html and 2 of these. i would rather go with the 4000's but with the 4s's you get more thrust as the motors spin faster.
i had 90 size skids and they were really big but not tall enough to hang a camera under. why not get a set of legs from yuri? I found leaving my battery up top and hanging the camera off the bottom worked best. makes a constant negative g on the camera
edit: the align skids have 2.25" clearance under them, thunder tiger 60 skids got 2.75" and there considered "lifted" both are bulky and heavy and the only way to mount was off the flimsiest part of the frame. Tried it for a day