[ELI5] How do “OEM replacement” batteries exist for a device that is several years discontinued? And do they genuinely work better than the battery they are replacing?

Question

I bought a used $20 Samsung Galaxy J7 (2015) since the screen looked to be in perfect condition. I do not know if the seller replaced the battery, but even so, how would a “brand new” battery from 2015 be any better than the current battery inside?

In: Technology

Answer 1

The term “OEM replacement “doesn’t necessarily mean it is an OEM brand. Just that it will match the form and function of an OEM unit.