I bought a samsung stock battery with charger for 35$. Money isnt the problem. The problem is quality control. And I think Samsungs quality control and mAh ratings are much better and more accurate that these cheap ass chinese manufacturers that are cranking out portable explosive devices... I have tried these cheap China batteries, and they are underpowered opposed to their stated strength, and can meltdown, or just take up to omuch space for the little gain they offer. I know if Samsung releases an extended battery, you could trust it. And you could trust the stated mAh ratings. I am sure a lot of people would buy the Samsung brand just because its easier to trust...