How does Apple 4s view battery health?

Mobile phone model: iPhone

1. Wake up call. After entering the mobile phone desktop, you can find the settings icon and open it.

2. After opening the setting icon, you can find the battery bar and open it.

3. After opening the battery bar, you can find the battery health (beta) bar and click Open.

4. After opening the battery health (beta), you can find the column of maximum capacity, which shows the percentage of the battery health of the mobile phone.