14000 mAh Portable USB Power Bank/External Battery for OnePlus 6, 6,5T, 5, 3T, 3, 2, OnePlus 3, OnePlus 2, ( USB Type C Cable and Micro USB Cable are Included) - Black - Walmart.com
(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% and now 99% I hang on to this phone for a while : r/oneplus