Im sure it will be a good phone but lets just say I bought a Note 5 and decided I loved it so much I decided to use the note 5 forever, well guess what batteries degrade over time and eventually the note 5 will probably become useless. As for the Note 4 just buy a new battery!
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The battery is sealed in not irreplaceable. I think many folks forget that. Sealed batteries in devices is nothing new. No, they are not swappable but can be replaced if they fail. Just not by the user unless they are qualified to do so.