opjose and myself have been discussing this model over at the NitroModels support forum in a thread found here:

http://www.rcuniverse.com/forum/m_49...tm.htm#4981664

As for holding the TP 2100 battery in place, I'm just using a block of soft foam inserted into the battery compartment and then wedging the battery in between the foam and the bottom of the plane. Works for me.