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我想用BQ24170给锂电池充电，我想用5V输入给两节4.2V的锂电池充电，可以实现么？输入电压必须高于8.4V么？数据手册写道，在一节电池的时候，可以实现一边充电一边给系统供电，请问，两节电池就不可以实现了么？原文如下：
您好，The input voltage must be above the battery voltage because this is a buck charger. 5V输入给两节串联的锂电池充电，不可以实现
