This shows that the battery health of your mobile phone is less than 80%. The setting of Apple's device is that if your battery health is below 80%, it will display maintenance. If you think that the standby time is too short, it will seriously affect your experience, then replace it with a new battery.
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Apple's recall of the first generation of iPodnano around the world has become the news that many iPod users pay attention to. The main reason is that the battery may overheat, causing safety hazards. The affected iPod nano was sold between September 2005 and February 2006.
Users can enter the product serial number on the back of the player in official website to find out whether it belongs to the recall series. In fact, it's not the first time that the battery problem of iPod has happened. Apple's "battery door" incident has occurred many times.