Under what conditions? What shutter speeds you using? It shouldn't consume that much battery power because the SSS only kicks in when you press the shutter (unlike consumer compacts when stabilisation is happening all the time.) I leave mine on all the time, and I can easily hit 600++ shots in a day w/o batt change.
The general guideline to ensure shake-free shots is the reciprocal of the focal length used. Get a telephoto lens, say 300mm, and instead of shooting it at 1/300s, try 1/30 sec or even 1/15 sec, with and without SSS. And remember, your camera handling fundamentals must still be sound throughout!
If there's really no diff (i.e blurry shots regardless), then maybe either there's problem with your technique, or the SSS is malfunctioning. OR maybe you so steady until you can handhold at 1/10 sec with no problems, then of course there will be no diff. There are people out there who consistently get tack sharp shots at 1/2 sec.
For what it's worth, according to some magazine reports, lens-based stabilisation is marginally better than in-body sensor stabilisation. But that doesn't mean in-body is no good. And furthermore, every lens in your system is now stabilised, and that is a huge practical advantage.