Meanwhile, people all over the world are waiting for the Chinese to create, for at least $8-15 (Apple batteries cost about that much in bulk, according to Fixit), complete analogues of the original branded batteries for many old smartphones. And the Chinese are selling some useless junk, which in reality is 2-3 times less in capacity and number of cycles than the original batteries, even from 2015(!). Progress is bypassing Chinese factories producing compatible batteries for smartphones...
If there really has been progress in batteries over the last 5-6 years, why isn't there any progress in smartphone batteries? Especially from semi-basement manufacturers? After all, advanced technologies should gradually seep into the second echelon of spare parts manufacturers, right?