iPhone battery health directly affects battery life and performance, and you can view the maximum capacity and peak performance capabilities through settings. Open Settings → Battery → Battery Health to view relevant information; if the maximum capacity is less than 80%, or sudden shutdown or severe heat occurs, the battery should be replaced; third-party tools such as IS Assistant can assist in detection, but the data is for reference only; extending the battery life requires avoiding low-voltage use, high-temperature environments and long-term full-charge storage.

The health of iPhone battery has a great impact on the user experience of the device, especially battery life and performance. If you find that your phone is using it more and more power, or if you can't last long after charging it once, the battery condition may be worse. In fact, Apple has provided a way to view battery health in the system, and no additional tools are needed.

Where to look at battery health?

Open Settings → Battery → Battery Health (some models may directly display the "Baty Health" menu), and you can see the current battery's maximum capacity and peak performance capabilities.

• Maximum capacity : refers to the percentage of the current battery with respect to the new battery. For example, if 85% is displayed, it means that the original new battery can only be used for 85% of the time after fully charged.
• Peak performance capability : This is mainly to determine whether the battery affects the performance of the mobile phone. If the battery says "This battery is normal", it means that the frequency reduction is not caused by the aging of the battery; if there is a prompt that it needs repair, then you should pay attention.

This feature has been added since iOS 11.3. If your system is too old, you can't see it, remember to upgrade the system first.

How much is normal? When should I change the battery?

Generally speaking, the maximum capacity is more than 80% , but if you are inconvenient to charge when you go out frequently, or feel that the battery life has significantly slowed down, you can consider replacing it even if it is higher than 80%.

• Common situations where battery replacement is required:
  • Maximum capacity is less than 75%
  • The phone is turned off occasionally
  • Severe heat during charging, or frequent battery jumps
  • The system prompts "Battery repair is required"

Some users will encounter these problems after using them for about two years, especially the frequent charging and discharging of daily use may make battery loss faster.

How do third parties view battery health?

If your iPhone is older, or you suspect that there is a battery problem but the system does not provide complete information, you can use some third-party tools to assist in the judgment. For example, by connecting to the computer through apps such as "Iss Assistant" or "Hourglass Inspection Machine", you can see more detailed data such as battery cycle times, designed capacity and current capacity comparison.

However, it should be noted that the data of these tools are for reference only and are not necessarily completely accurate. The data provided by Apple is the most authoritative. If you are planning to change the battery after-sales service, it is best to check the official data yourself first to avoid being fooled.

Suggestions: How to extend battery life

Although lithium batteries are not as afraid of being full and full as before, there are still a few points to pay attention to:

• Try not to use 0% of the power or charge it all the way to 100%
• Avoid being in high temperature environments for a long time, such as fast charging while playing large games
• When not in use for a long time, it is best to keep the power at around 50%.

Pay more attention to the battery status and make preparations for replacement in advance, otherwise one day the battery life will suddenly drop severely, which may delay problems.

Basically all this is it, it is not complicated to check, but it is easy to ignore details.

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