For those of you that are contemplating, just got the mugen 3800mah battery and seems to be excellent. First day got 30 hours with with use that I was getting 12-14 hours with on standard battery. Battery door is great...feels like original. phone is a little heavier and slightly bulkier, but I kinda like it. Had to get a new case to fit it. Will come back in a bit to update...I think the life will get even better.