First thing I would like to know the AC adapter charger which you are using is from the dell itself. As sometimes people use the AC adapter for the charging the laptop batteries which are not certified which lets you to damage the adapter early and also due to that the battery gets affected. And sometimes laptop recognizes that the charger/adapter which you are using it is not the genuine one which comes from the dell or from any reputed company. So if you are not using the certified adapter than you should use the one from it and charge the battery.
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