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The battery health of an iPhone can decline over time due to several factors:

1. Number of Full Charges: Every time you charge your iPhone to 100% and let it discharge completely, this is known as a full charge cycle. Over time, the battery's ability to hold a charge can decrease with each full charge cycle. This is because the chemical reactions inside the battery that generate power can become less efficient as the battery ages.
2. Age of the Battery: Batteries have a shelf life, and over time, they can start to degrade. This is why it's recommended to use a new battery if your old one is showing signs of aging.
3. Overcharging: Overcharging your iPhone can also degrade the battery health. Apple's iOS has a feature called "Optimized Battery Charging" that prevents the battery from charging above 80% to extend the overall lifespan of the battery. If this feature is disabled, overcharging can cause the battery to lose capacity more quickly.
4. Temperature: High temperatures can accelerate the rate at which a battery degrades. This includes not just the temperature of the device itself, but the environment around it.
5. Depth of Discharge: How often you discharge your battery to near 0% can also affect its lifespan. Frequently discharging your battery to near 0% can lead to faster degradation.
6. Care and Maintenance: The care and maintenance of your device can also impact the battery health. This includes how you handle the device, whether you drop it, and how clean the device is.

To maintain your iPhone battery health, Apple recommends using the device with a 20% to 80% charge and not leaving the device plugged in all the time. Regularly checking your device's battery health can also help you identify any potential issues early on.

Sources:

• Apple Support: Battery Health and Performance
• MacRumors: How Battery Health Declines Over Time
• TechRadar: How to Prolong iPhone Battery Life