OnePlus reportedly offering a free battery replacement for OnePlus 3, 5 and 6 series phones - OnePlus Lover
For OnePlus 3 Three Battery 1+3 Battery Replacement BLP613 2900mAh Tools | eBay
An original OnePlus 3 battery looks like this : r/oneplus
Original For Oneplus 3T BLP633 Battery Replacement For Oneplus 3T BLP633 Mobile Phone Battery 4200mAh With Tape - AliExpress Cellphones & Telecommunications
Mobile Phone, Telephone Battery Replacement for OnePlus BLP633 - 3400mAh, 3.85V, Li-polymer - Electropapa
Battery/Charging - "Battery does not match" - OnePlus Community
Buy Asesino Battery Compatible with OnePlus 55T 3300mAh with Replacement Toolkit BLP637 Online in Japan. B082PQDNXN
OnePlus 3 Teardown Part I: Battery Replacement - SlashGear