This is because the battery in the Airpods may not show a full charge, even if the power adapter has been connected for a long time. The battery may stop charging after it reaches 93% to 99% charge. This is a normal phenomenon and helps to extend the overall life of the battery.
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Apple AirPods are earphones for the iPhone 7, which were released at Apple's 2016 Fall New Product event on September 8, 2016. The built-in infrared sensor can automatically recognize whether the headset is playing automatically in the ear, and Siri control can be controlled by double-tapping. Battery life of 5 hours, with headphones automatically play music, beam microphone effect is better, double-click the headset to open Siri