Battery malfunction? Unable to calibrate...

Hello, people of Earth!

It has been almost 3 years since I bought my OnePlus 5, taking good care of it from the beginning, so that its longevity is maximized. For the past couple of months, I’ve been having to deal with a problem, that I have not been able to fix by any software, reboot or other non-teardown ways.

The indicator/number for the battery-charge on the screen is just completely out of sync with the actual battery capacity. If I drain it completely, charge it to 100%, then it will dip to 1% within few hours and then stay there for over a day before shutting down (in the middle of a task, let’s say). There are very few instances, where I’m able to get the indicator close to reality, but this includes precision and timed charging time, which is just inconvenient and quite random.

I’ve waited for couple of updates, but no fix came, so I’m now quite confident in that it is a hardware issue, given that most smartphones last merely 1-2 years these days.

My set of questions…

  1. Could you confirm this is most likely a hardware problem?
  2. Would a battery replacement most likely fix this problem?
  3. …or is there some other part responsible for the monitoring of battery capacity?
  4. Additionaly; does battery replacement make the phone lost its water resistance?

Thank you :)

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