2 years from now: battery

Without considering the current state of facts. Imagining I am going to buy the Samsung note 7 in October. What I will do when in a couple of years as hard user the battery have to be replaced? I saw on youtube that is extremely hard to open it , and small fix shops could have some problems. How much it cost to ask Samsung to change it? And will the water resistant feature restored? I mean after all there is any guarantee for water damages. Thanks

from xda-developers http://ift.tt/2ckffkI
via IFTTT