The first case: the box has virtual electricity.
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We're all too familiar with this. Sometimes it happens with cell phones. So what is to be done?
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First use 10% of the charging box power, then rush to 100%, and then charge for half an hour, this process is called battery? Correct.
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In fact, this situation is more common for newly bought Airpods. Babies don't need to panic, just do this once or twice.
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How often do you open the lid of your charging case?
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In fact, many people think that the charging box is a container for putting headphones and charging, but ignore some of its characteristics, when we open the lid, it will cause it to discharge continuously, resulting in a reduction in power, power loss too fast.
This may be that the headset is used for too long, or it is relatively old, resulting in battery loss. This charge is not fully charged.