Abstract: A battery measurement system includes: a battery including terminals and a housing case, and a battery measurement device. The battery measurement device includes: a signal control unit provided on a first electrical path connecting positive and negative electrode external terminals and configured to receive or apply an AC signal, a response signal input unit provided on a second electrical path connecting positive and negative electrodes of an electrode body and configured to receive a response signal to the AC signal, and a calculation unit configured to calculate complex impedance information based on the response signal. The second electrical path is wired from the response signal input unit toward the inside of the housing case so that a magnetic flux passage area surrounded by the electrode body and the second electrical path is smaller in magnitude than an area surrounded by the electrode body, the terminals and the housing case.

Abstract: An AC adapter having a dual-bodied plug that can be rotated by 90 degrees relative to the adapter case so that the plug can be stored in the case when the adapter is not used and drawn out of the case when the adapter is in use. A blade distance adjusting unit provided in the case adjusts the distance between the blades of the plug. When the plug is drawn out of the case, the distance between the blades is increased up to the predetermined value. When the plug is stored in the case, the distance between the blades is reduced. The AC adapter can use a thinner case than conventional AC adapters of which plugs are monolithically structured.

Abstract: An AC adapter having a dual-bodied plug that can be rotated by 90 degrees relative to the adapter case so that the plug can be stored in the case when the adapter is not used and drawn out of the case when the adapter is in use. A blade distance adjusting unit provided in the case adjusts the distance between the blades of the plug. When the plug is drawn out of the case, the distance between the blades is increased up to the predetermined value. When the plug is stored in the case, the distance between the blades is reduced. The AC adapter can use a thinner case than conventional AC adapters of which plugs are monolithically structured.