I'm sorry if this has been covered, but I couldn't find anything on it.
First I'd like to say that the receiver battery box on the XXX-NT seems needlessly difficult to open. So, is there a quick-release box out there? That would really be the best solution.
Second, if not, which battery packs fit in there, size- and voltage-wise? I found this one, but it's out of stock:
http://www.losipartshouse.com/servle...tz-1400/Detail There's got to be another place to find this, or something that works.