A charging method for multiple cells, comprising: converting a received charging voltage to obtain a converted charging voltage, said received charging voltage being outputted by a power supply device, wherein the power supply device is an adapter; and charging multiple cells (202, 203) connected in series with the converted charging voltage, the charging method further comprising: obtaining charging parameters of the multiple cells connected in series, wherein the charging parameters comprise at least a voltage and/or a charging current of each single cell; and feedbacking charging parameters to the power supply device, wherein the charging parameters are configured to instruct the power supply device to adjust an output voltage and/or an output current to meet a voltage and current required by the multiple cells connected in series, wherein charging the multiple cells connected in series with the converted charging voltage, comprises: when the converted charging voltage corresponds to a first charging mode, applying the converted charging voltage to both ends of the multiple cells connected in series by a first charging circuit corresponding to the first charging mode, wherein the converted charging voltage is greater than a total voltage of the multiple cells connected in series, and when the converted charging voltage corresponds to a second charging mode, applying the converted charging voltage to both ends of any single cell of the multiple cells connected in series by a second charging circuit corresponding to the second charging mode, wherein the converted charging voltage is greater than a voltage of the single cell, and the converted charging voltage is less than the total voltage of the multiple cells connected in series. converting a received charging voltage to obtain a converted charging voltage, said received charging voltage being outputted by a power supply device, wherein the power supply device is an adapter; and charging multiple cells (202, 203) connected in series with the converted charging voltage, the charging method further comprising: obtaining charging parameters of the multiple cells connected in series, wherein the charging parameters comprise at least a voltage and/or a charging current of each single cell; and feedbacking charging parameters to the power supply device, wherein the charging parameters are configured to instruct the power supply device to adjust an output voltage and/or an output current to meet a voltage and current required by the multiple cells connected in series, wherein charging the multiple cells connected in series with the converted charging voltage, comprises: when the converted charging voltage corresponds to a first charging mode, applying the converted charging voltage to both ends of the multiple cells connected in series by a first charging circuit corresponding to the first charging mode, wherein the converted charging voltage is greater than a total voltage of the multiple cells connected in series, and when the converted charging voltage corresponds to a second charging mode, applying the converted charging voltage to both ends of any single cell of the multiple cells connected in series by a second charging circuit corresponding to the second charging mode, wherein the converted charging voltage is greater than a voltage of the single cell, and the converted charging voltage is less than the total voltage of the multiple cells connected in series. obtaining charging parameters of the multiple cells connected in series, wherein the charging parameters comprise at least a voltage and/or a charging current of each single cell; and feedbacking charging parameters to the power supply device, wherein the charging parameters are configured to instruct the power supply device to adjust an output voltage and/or an output current to meet a voltage and current required by the multiple cells connected in series, wherein charging the multiple cells connected in series with the converted charging voltage, comprises: when the converted charging voltage corresponds to a first charging mode, applying the converted charging voltage to both ends of the multiple cells connected in series by a first charging circuit corresponding to the first charging mode, wherein the converted charging voltage is greater than a total voltage of the multiple cells connected in series, and when the converted charging voltage corresponds to a second charging mode, applying the converted charging voltage to both ends of any single cell of the multiple cells connected in series by a second charging circuit corresponding to the second charging mode, wherein the converted charging voltage is greater than a voltage of the single cell, and the converted charging voltage is less than the total voltage of the multiple cells connected in series. when the converted charging voltage corresponds to a first charging mode, applying the converted charging voltage to both ends of the multiple cells connected in series by a first charging circuit corresponding to the first charging mode, wherein the converted charging voltage is greater than a total voltage of the multiple cells connected in series, and when the converted charging voltage corresponds to a second charging mode, applying the converted charging voltage to both ends of any single cell of the multiple cells connected in series by a second charging circuit corresponding to the second charging mode, wherein the converted charging voltage is greater than a voltage of the single cell, and the converted charging voltage is less than the total voltage of the multiple cells connected in series.