充电宝的电池是锂电池，电池重量大部分固定不变，1个2000mA的锂电池约重40克，1个20000mA的电源要10个2000mA的锂电池，总重约400克。等同于1个充电头和备用电池的结合体，对比后备电源来讲可以将其1个充电器插头装置，而相较于充电头它也本身具备储电设备，也可以在并没有直电源或外出时给电子产品给与后备电源。
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