Okay I found the fabled Unicorn of Samsung batteries. "Made in Korea"
That's it, straight up made in one place with both the cell and assembly. I'm assuming both the cells and assembly was done in Korea. (I went back to the Samsung Store)
So I just did a face off against the 2200 Anker, and yes it does sound better. There is improved clarity and the bass sounds more tight, extended; also has more air and focus to the music. It sounds better seperated/holographic. Everything sounds a bit loose/fuzzier with the Anker. The Samsung Made in Korea also sounds more dynamic, adding some hefty punch. The dynamics now exceed the X5, which was the other way around before the battery swap.
So yeah my other OEM S3 battery assembled in China (came with my original Samsung S3 phone) sounded a little worse than the Anker, this one sounds noticeably better.
I will be doing A/B'ing more extensively using all three + the original DX90 Pisen battery just to make sure I'm not full of schiit. Haha. I will try to set up a blind test with the help of some friends if possible. I wanna "keep it real".
But yeah the Made in Korea battery does sound pretty substantially better at the moment, it's kind of borderline where I don't even need to bother doing any more tests. I will, just for the sake of science and the pride of a skeptic.
Edited by M-13 - 6/20/14 at 4:17am