How to use the battery best, do you need to use it before charging, and so on

So write this paragraph to solve the doubts about battery usage.

Try to use easy to understand vocabulary to help everyone clarify.

Take Apple's products as an example. Other brands may be different.

Please refer to the corresponding brand's official website or after-sales department for specific inquiries.

Firstly, battery life.

How long can a battery last.

IPhone: Charging cycle more than 500 times.

Exceeding 500 does not mean it is completely unusable, it simply cannot meet the standards of new batteries.

What data will decrease: battery capacity, power supply voltage, etc