This is because the maximum capacity of the battery has diminished. If you are using your phone for video calls or gaming, the duration of a full charge will be considerably shorter than if you were only checking emails or reading static text documents.
How Low Power Mode Extends Your iPhone Battery Life on a Single Charge
Official Apple Estimates and Real-World Variables Apple provides official battery life estimates for each model, stating that an iPhone can last up to a specific number of hours for tasks like video playback or internet use. Battery Health Percentage Expected Impact on Duration 100% Full rated runtime as per Apple's estimates.
You can check this health metric in Settings under Battery Health; a battery with 80% maximum capacity will generally provide significantly less time between charges compared to when it was new at 100%, making the question of "how long" increasingly dependent on the current health of the hardware. Users often wonder why a phone that once lasted all day now requires a midday top-up, even if the usage pattern has not changed significantly.
How Low Power Mode Extends Your iPhone Battery Life on a Single Charge
80-99% Slight reduction in time, may require one mid-day charge during heavy use. Similarly, connectivity features such as 5G, Bluetooth for accessories, and GPS for navigation place a heavy load on the battery.
More About How long should an iphone battery last when fully charged
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