Amazon.com: E-YIIVIIL Replacement Battery BLP813 Compatible with Oneplus Nord N100 BE2011, BE2012 with Tools : Cell Phones & Accessories
Heavy-Duty 3520mAh Replacement BLP613 Battery For 1+ OnePlus 3 Three A3000 A3003 | eBay
OnePlus 3 Quick Tear Down For Screen DIY Repair
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