A study was made of the electron paramagnetic resonance ͑EPR͒ in electrolytically and chemically prepared manganese dioxides intended for use in power sources. A typical EPR signal for the powdered MnO 2 samples is wide single line with g ϭ 1.94. The replacement of some Mn 4ϩ ions by Mn 3ϩ modified the character of the exchange interaction. A correlation was established between the width of the EPR signal and the ionic conductivity value as well as Mn 3ϩ /Mn 4ϩ ratio and OH Ϫ groups contents in the samples. It is supposed that the EPR data can be useful for the semiquantitative expression of chemical and electrochemical activity of different MnO 2 samples. In some samples EPR signals with g ϭ 2.000, A ϭ 8.81 mT ͑A is hyperfine structure parameter͒ were revealed due to the presence of MnSO 4 water solutions traces.
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