iflyatcae
Yes that was the discharge method I was talking about, they may need to be cycled a few times though, if after 3 cycles if they don't come back, then it is time for new batteries.
I just checked out the PJS 550E, I'm not sure of the dimensions of the motor cavity in the Cobra, but this motor too is firewall mounted, in the Cobra motor cavity you may be able to mount a piece of thin plywood (the kind you find in the bottom of a small wooden draw), then mount the PJS 550E to that. ( got motor info from here
http://www.hobby-lobby.com/brush less_external.htm ), this motor would be better in the AB where the P21 from here
http://www.hobby-lobby.com/brush less_external.htm would be better in the Cobra.
The PJS 550E has a smooth shaft for mounting folding prop, the P21 takes a GWS style prop.
Hope it helps