I think what is more important should be the "mAh" rating.
As with camera batteries, the higher the "mAh" rating, the more shots you can take using that batt (longer lasting).
So this 4200mAh batt should not be far away from the 4400mAh's batt life.

I think....

This post has been edited by PCHo: Dec 12 2008, 12:07 PM

Reviews say 3+ hours on the batt.
But seems to me this is more like a better looking 1000H only.
Performance should be more or less the same.