An original OnePlus 3 battery looks like this : r/oneplus
Blp613 3000mah Phone Battery For Oneplus 3 One Plus 1+3 Battery For Onplus 3t 3 T A310 Battery Replacement Blp633 - Mobile Phone Batteries - AliExpress
100% New Battery For OPPO BLP633 1+3T OnePlus 3T 1+ High Quality Replacement | eBay
High Capacity 5220mAh Replacement BLP633 Battery For Oneplus 3T A3010 A3030 USA | eBay
OnePlus 3 gets disassembled for battery replacement - Android Community