Understanding iPhone Battery Voltage and Its Relationship with Capacity

2024-01-16 14:56:26 DEJI Battery 0

Since the launch of the first iPhone over a decade ago, battery capacity has been a key focus for users anticipating each new model. However, what's less known is the impact of iPhone battery voltage on this capacity. This article delves into the concepts of iPhone battery voltage and capacity, providing a deeper insight into iPhone batteries.

What is iPhone Battery Voltage?

The Evolution of iPhone Battery Voltage

How is iPhone Battery Capacity Determined?

Apple lists iPhone battery capacities in its official specifications, reflecting maximum storage capacity under standardized test conditions. However, actual performance can vary due to factors such as temperature, battery aging, and usage patterns.

Design Capacity vs. Actual Capacity

Battery Voltage and Usage Time

An interesting fact is that lithium batteries tend to have longer usage times when they're at nominal voltage. Usually, the 20%-80% charge range maintains the battery at nominal voltage, which is why Apple recommends this charging and discharging range.

Calculating iPhone Battery Health Percentage

When checking battery details, battery life is often shown as a percentage. This number represents the battery's wear and is calculated as Battery Life = Actual Capacity / Design Capacity. The resulting percentage is the current battery life.


Understanding the nuances of iPhone battery voltage and capacity offers more than just technical knowledge; it empowers users to make informed decisions about their device usage and maintenance. As we've seen, the evolution of iPhone battery technology, from the iPhone 4 to the latest iPhone 14, demonstrates Apple's commitment to enhancing battery performance while balancing longevity and efficiency. 

The relationship between battery voltage and capacity is a critical aspect of this evolution. Higher voltages in newer models correlate with increased capacities, providing users with longer usage times and more reliable performance. However, this also underscores the importance of proper battery care. Adhering to recommended practices, such as maintaining a charge between 20%-80%, can significantly extend your iPhone's battery life and ensure its optimum performance over time.


Do you need help? We are DEJI, a professional mobile phone battery manufacturer. Our latest product, the DJ battery, is made from the highest quality raw materials and can display a 100% health status.