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BQ24040设计的充电电路（规格书原理图），应用在头戴耳机。经过头拱线。24040充电处于4V的时候，芯片就个转灯信号标准充电。实际未到4.2V。量IC也是4V，实际还是保持在充电状态。
1.将电池直接接到IC BAT输出处，线阻太大可能会产生此问题
2.设置充电电流是否合适，通常不超过1C
3.Timer是否设置太短，造成充电循环未完成
