How to test iphone battery quality？

To test the quality of an iPhone battery, you can use the following methods:

1. Check battery health in iOS settings: On your iPhone, go to "Settings" > "Battery" > "Battery Health." Here, you can view the maximum capacity and peak performance capability of your battery. A higher maximum capacity indicates a better battery health status.

2. Monitor battery usage: Keep an eye on your battery usage patterns. If you notice a significant decrease in battery life or a faster-than-usual drain, it could indicate a degraded battery.

3. Measure battery capacity with third-party apps: There are various third-party apps available on the App Store, such as Battery Life and CoconutBattery, that can provide detailed information about your iPhone's battery capacity. These apps can display the current capacity compared to the original capacity and help assess the battery's health.

4. Perform battery stress test: You can run a battery stress test on your iPhone to evaluate its performance and endurance. This can be done by using apps that put a heavy load on the battery, such as benchmarking tools or graphics-intensive games. Observe how well the battery holds up during intense usage.

5. Consult Apple support or authorized service provider: If you have concerns about your iPhone battery's quality, it's advisable to seek assistance from Apple support or visit an authorized service provider. They can perform professional diagnostics and provide accurate assessments of your battery's health.