icopy plus

Remove original battery from phone, take off battery BMS flex from battery, and do not break the flex in the process
Get replacement battery, choose good brand like Aplong battery. Remove BMS flex from replacement battery.
Use spot welder to attach original BMS flex to replacement battery cell.
Use QianLi iCopy tool and QianLi QR Helper software to write new battery data below:

Charge Cycle = 1
Capacity = 100% 
Use battery activator or bench supply to activate battery. (Google this lots of videos on YouTube)
Use bench supply and iPhone DC battery cables for bench supply to power on the iPhone and this will use exploit we need in iOS to create a needed flaw in software, once powered on it will show the battery warning still. Power off phone and remove dc power.
Connect replacement battery and job is now complete, to confirm is all ok, go in settings and now you will see the battery warning is gone 🙂 and also you can see battery health as normal.