Apple Watch Series 4 BatteryCapacity: Approximately 291.8 mAh.
Expected Battery Life: Officially rated at approximately 18 hours of mixed use (including checking time, receiving notifications, using apps, and exercising).
About the “Apple Watch Series 4 Battery Health” Feature
Apple Watch Series 4 running watchOS 7 or later has a “Battery Health” feature similar to that on iPhones, which you can view directly on your watch.
How to View: Open “Settings” on your Apple Watch.
Scroll down and tapApple Watch Series 4 Battery
Tap “Battery Health”.
You will see two key metrics:
Maximum Capacity (%):
Meaning: Measures the capacity relative to a brand new battery. As the battery’s chemistry ages, its capacity naturally decreases, resulting in shorter battery life per charge.
Health Status Interpretation:
100% – 80%: Normal range. The Apple Watch Series 4 Battery is in good health.
Below 80%: The battery is significantly aged. At this point, the system may display a “Battery health is declining” message and may enable “Optimize charging limits” to protect the battery. While the watch will still function, battery life will be significantly reduced.
If the Apple Watch Series 4 battery is severely aged: When the watch unexpectedly shuts down, the system may automatically enable “Performance Management” (i.e., throttling) to maintain stability and prevent further shutdowns. A related message will be displayed here.
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