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The battery life of an iPhone can vary depending on several factors, including the model of the iPhone, the tasks you're performing, and your settings.

For example, an iPhone 12, which has a 2500mAh battery, can last up to 17 hours on a single charge when using standard settings and moderate usage. This can include browsing the web, sending and receiving texts, and using apps like Safari, Mail, and Messages.

However, if you're using more power-intensive tasks like watching videos, playing games, or using heavy apps, your battery life will naturally be shorter. Similarly, if you have a high-brightness display setting, a fast charging setting, or if you're using a case that doesn't have a battery, your battery life could be significantly reduced.

It's also worth noting that the battery health of an iPhone can decline over time, which can affect its overall battery life. Factors that can affect battery health include the age of the battery, the number of full charges it has gone through, and the overall care and maintenance of the device.

In conclusion, while an iPhone can last up to 17 hours on a single charge with moderate usage, the actual battery life can vary depending on various factors. It's always a good idea to check the battery usage on your iPhone to see which apps are using the most power and adjust your settings accordingly to maximize your battery life.

Sources:

• Apple Support: Battery Health and Performance
• MacRumors: How to Maximize Battery Life on Your iPhone
• TechRadar: iPhone 12 battery life review