We tested various battery chargers, and all battery chargers did not show any readings in the idle state. But they do consume power, no reading does not mean that these chargers do not consume electricity at all.
Thus, in the fuel gauge with a row of rows, and then inserted in the plug row on a variety of chargers. This may result in a measurable power loss in the fuel gauge. And then insert the charger to the top of the charger and observe the readings, insert a number of consecutive, the reading is still 0.0 watts. However, when a sixth charger was inserted, a measurable power reading occurred, with a reading of 0.3 watts.