Actually my comment was of a general nature related to 2.4 systems. Ihad heard (possibly incorrectly), that all these systemswill shut down power to the receiver temporarily, long enough to have a problem if the model is too close to the ground.

Ihave a Spektrum Tx/Receivers and did some more research after Iread the posting from airbusdrvr; all my receivers do have the latest firmware so Ishould be OK. I will just go ahead and use my 4.8V battery pack.