We have now learned why Samsung, Apple, etc seal the units so that you cannot replace the battery. After a few years, they send out a update that drops your battery charge like with the Note 7. Maybe 1st update drops it to 90%, 2nd update to 75%. Soon you upgrade your phone because you think your battery is bad, and you can't replace it. It could be your carrier. The battery probably wasnt bad at all. They made it look bad by dropping the charge it takes. They can even cut the battery off so you will have to upgrade your phone. Pretty smart idea.
