A battery capable of improving cycle characteristics is provided. A cathode contains an oxide containing lithium and manganese such as Li.sub.4Mn.sub.5O.sub.12 as a cathode material. An anode contains a carbon material as and anode material. The weight ratio of the cathode material to the anode material is in the range from 2.03 to 2.53. The electrical capacity ratio of the cathode to the anode is in the range from 0.8 to 1.0. The open circuit voltage in full charge state per a pair of cathode and anode is from 2.9 V to 3.2 V.