帕萨特d挡

我是2019款帕萨特，昨天晚上开去的，回不来了，先是打火吃力感觉是电瓶损电，打燃火了挂D挡松刹车就歇火。请问是什么缘由？

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我在降速时习惯切替换到B挡让车降速，而不是踩刹车，觉得如许能量吸收充沛，利于充电，如许对于车有坏处吗？