Well, Energy Mode is only for camping, so you regenerate energy. A match for me is like that : I cloak up, run around, see that the energy is low, run to a corner/safe place, deactivate cloak, crouch, camp till my energy is full again, cloak up and run around. Energy Mode isn't a mode, it's the nanosuit without any mode activated. I'd wish to disable energy actions (running, power jumping) in stealth mode and make Energy Mode a lil' bit faster than stealth mode. Since stealth is part of the game, but overused, armor mode is just for battles and energy mode when you are OUT of energy. So the basic mode is stealth, and that's just wrong!
/discuss