It's okay. Do not affect
Apple AirPods are only usable. Many people are like this, because the Bluetooth earphone is often out of power, so many people are a re-use, a re-charge. AirPods use optical sensors and motion acceleration sensors to detect if they are in your ears, and if you want an AirPod to listen to music, you can manually tap the play button to play music, or manually tap the video play button to play video.
No, you can only take one, the other one in the box to charge.