That's the point. There is no chance to find a ready plug-and-play battery outside of fxtec. We can only find a close enough size and transfer the BMS with cable to another cell.
https://vi.aliexpress.com/item/1005002957619888.html
2000mAh battery which will be 100% fitting into the Pro1. Always something...
(lineage-20.0-20231118-nightly-pro1-signed.zip on Nov 5 security patch installed smoothly (*) using adb sideload and MindTheGapps-13.0.0-arm64-20230808_213316)