Here's how to replace your smartphone's battery - Android Authority
Oneplus 7Pro) After 3 years I finally replaced my back and battery!! Total $25. It was tough but really fun process to do. Took about 30minutes. The battery health was around 78%
How to Claim OnePlus 3, 3T, 5, 5T, 6, and 6T Free Battery Replacement? | DesiDime
100% New Blp613 3000mah Replacement Battery For Oneplus 3 One Plus 3 Three Cell Phone Batteries - Mobile Phone Batteries - AliExpress
For OnePlus 3 Three Battery 1+3 Battery Replacement BLP613 2900mAh Tools | eBay
OnePlus is offering battery replacement for OnePlus 3, 5 and 6 series
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