I have a delta rey two prop electric. the motors no longer have enough power to lift the plane. If it were just one of the motors, I would assume it was a faulty motor but neither motor has full power. could it be the control panel? mybrother has the same plane used his battery and still same result(not enough power) but same battery worked fine in his plane....

Esc?

I also think you should try to check if anything wrong with your ESCs?