Is it normal for the battery health of Apple xr to drop to 90% after using it for about one and a half years?

This should be normal. After using my iPhone XS Max for one and a half years, the battery health is only 90%. I don't have much habit of playing mobile games, and I don't have much habit of playing games while charging. Because the high-frequency mobile phone temperature is too high or other habits will affect the performance of the battery.

Product evaluation

IPhone 4 is a memorable product in the history of iPhone. It is even considered by many fruit fans as the best product in iPhone design, and it is a classic of Apple founder Steve Jobs.

The overall design of iPhone X can be described as "round". The surgical stainless steel frame is perfectly connected with the front and rear double glass panels, and the transition is smooth. Holding iPhone X in your hand may even give you a feeling of hating each other. It seems that this design should have appeared long ago.