Hi! I installed this battery successfully on my MBA mid 2012. It works fine but even after calibrating it properly and doing the SMC reset, I do not get longer battery life. Even though the capacity increased (4443 mAh at the moment) I get the same problem as before: at 20% remaining level battery level suddenly drops to 6% and the macbook turns off very quickly. I tried to calibrate multiple times, nothing changed.

Any ideas?

Thank you