The reason why the airpods open cover keeps flashing red is the connection problem between the two headphones.
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2. Put both headphones in the headphone case and open the cover.
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3. Long press the round button on the back of the headphone case, which should solve the problem.
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4. When you just put the headset in, the red light is because you are charging the headset. When you charge the headset box, the red light is the red light below 80% of the charging display.
The airpods charging case blinking red indicates that the battery is too low to fully charge the AirPods. You are advised to charge the AirPods in time to avoid affecting the normal use of the earphones.
It means it's saying it's out of power and needs to be recharged.