New battery not keeping charge?

Hi, so a week or so ago I ordered and installed a new battery from ifixit for my Macbook Air 13-in from mid 2011. Everything seemed fine and I got a few days where it was at the normal 5-6 hours range on a full charge. Now, however, Coconut Battery is already showing a health decline to 94% after just 9 cycles and battery life doesn't seem as good anymore either. This doesn't seem normal - perhaps I should seek a replacement from ifixit? Any of you have something similar happen?