Im so glad I replaced the battery on my 3+yr old Oneplus 6T. I could probably use it another 3yrs. Take it to a local shop if you dont diy : r/ oneplus
Here's How to Change the Nord's Punch-Hole to Battery Indicator
One Plus One Battery Replacement || How To Remove One plus one ( 1+1) Battery - YouTube
OnePlus One Battery Replacement - iFixit Repair Guide
OnePlus One Battery Replacement - iFixit Repair Guide
OnePlus Nord Battery Replacement - iFixit Repair Guide
Amazon.com: Kastar 1-Pack Battery and LTD2 USB Charger Replacement for Phase One P30 Plus P30+, Phase One P40, Phase One P40 Plus P40+, Phase One P45, Phase One P45 Plus P45+, Phase