What is Apple Watch Power Reserve Mode?

I know that like everyone you also have the same question that what will happen when your Apple Watch is completely out of charge? Battery life has been a major concern for the Apple Watch and other wearables — with current battery technology, there just isn't much space for a battery cell that can keep the device charged for a long time.

Apple Watch Battery life using Power Reserve Mode

Instead of becoming a wearable sundial, it can still tell the time in what the company calls a "Power Reserve" mode. This special battery-saving mode turns off app functionality in favor of giving users the ability to check time on the smartwatch for up to 72 hours. Testing conducted by Apple in March 2015 using preproduction Apple Watch and software with 4 time checks (4 seconds each) per hour. Battery life varies by use, configuration, and many other factors; actual results will vary.

In fact, if you should only check the time on the device and do nothing else, the device should be good enough to last up to five days, according to Apple’s official estimates.

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