Accoding to this:
[link]http://www.hobby-lobby.com/eco.htm[/link]

The Eco 8 takes a 3-cell 11.1 volt battery with a 3700 mAh capacity. The Trex 450 takes a 3-cell 11.1 volt battery with a 2500 mAh capacity. You probably do not notice the diference, but the 3700 battery will be much bigger than the 2500 battery. Bottom line is, that it might work, but you will only get about 3 minute flights if it even works without overheating.

Rafael