A method for detecting voltages of a plurality of battery cells (CELL1, CELL2, CELL3, CELL4) in a battery pack, wherein each battery cell of said plurality of battery cells is coupled to a respective converter of a plurality of converters (211_1, 211_2, 211_3), wherein said plurality of converters are coupled to anodes of said plurality of battery cells through a plurality of switching units (212_1, 212-2, 212_3), wherein an anode of said each battery cell is coupled to said respective converter through a respective first path of a plurality of first paths, and wherein a cathode of said each battery cell is coupled to said respective converter through a respective second path of a plurality of second paths, said method comprising: turning on a switching unit of said plurality of switching units, said switching unit corresponding to a battery cell of said plurality of battery cells, to enable said anode of said battery cell to provide an operating current and a sampling current through said respective first path for said battery cell to said respective converter for said battery cell, wherein said operating current flows from said anode of said battery cell through said respective converter for said battery cell to ground; and detecting a voltage of said battery cell by said respective converter for said battery cell, characterized in: duplicating, by a mirroring unit (410_1, 410_2, 410_3), an operating current and a sampling current of a first converter of said plurality of converters corresponding to a first battery cell of said plurality of battery cells, to reduce a difference between a current through a first path of said plurality of first paths that corresponds to said first converter and a current through a second path of said plurality of second paths that corresponds to said first converter, wherein said mirroring unit is coupled to said second path that corresponds to said first converter. wherein each battery cell of said plurality of battery cells is coupled to a respective converter of a plurality of converters (211_1, 211_2, 211_3), wherein said plurality of converters are coupled to anodes of said plurality of battery cells through a plurality of switching units (212_1, 212-2, 212_3), wherein an anode of said each battery cell is coupled to said respective converter through a respective first path of a plurality of first paths, and wherein a cathode of said each battery cell is coupled to said respective converter through a respective second path of a plurality of second paths, said method comprising: turning on a switching unit of said plurality of switching units, said switching unit corresponding to a battery cell of said plurality of battery cells, to enable said anode of said battery cell to provide an operating current and a sampling current through said respective first path for said battery cell to said respective converter for said battery cell, wherein said operating current flows from said anode of said battery cell through said respective converter for said battery cell to ground; and detecting a voltage of said battery cell by said respective converter for said battery cell, characterized in: duplicating, by a mirroring unit (410_1, 410_2, 410_3), an operating current and a sampling current of a first converter of said plurality of converters corresponding to a first battery cell of said plurality of battery cells, to reduce a difference between a current through a first path of said plurality of first paths that corresponds to said first converter and a current through a second path of said plurality of second paths that corresponds to said first converter, wherein said mirroring unit is coupled to said second path that corresponds to said first converter. turning on a switching unit of said plurality of switching units, said switching unit corresponding to a battery cell of said plurality of battery cells, to enable said anode of said battery cell to provide an operating current and a sampling current through said respective first path for said battery cell to said respective converter for said battery cell, wherein said operating current flows from said anode of said battery cell through said respective converter for said battery cell to ground; and detecting a voltage of said battery cell by said respective converter for said battery cell, characterized in: duplicating, by a mirroring unit (410_1, 410_2, 410_3), an operating current and a sampling current of a first converter of said plurality of converters corresponding to a first battery cell of said plurality of battery cells, to reduce a difference between a current through a first path of said plurality of first paths that corresponds to said first converter and a current through a second path of said plurality of second paths that corresponds to said first converter, wherein said mirroring unit is coupled to said second path that corresponds to said first converter.