A battery has a cathode, an anode, and a first solid electrolyte. The cathode contains a particle of a cathode active material, and the anode contains a particle of an anode active material. The first solid electrolyte is disposed between the cathode and the anode. At least one of the surface of the particle of the cathode active material and the surface of the particle of the anode active material is coated with a polyether-based organic solid electrolyte. The polyether-based organic solid electrolyte is in contact with the first solid electrolyte. The polyether-based organic solid electrolyte is a compound of a polymer having an ether bond and an electrolytic salt.