Lithium-manganese dioxide (Li-MnO2)
Lithium-manganese dioxide cells have a metallic lithium anode (the lightest of all the metals) and a solid manganese dioxide cathode, immersed in a non-corrosive, non-toxic organic electrolyte. They deliver a voltage of 2.8 V and are cylindrical in shape, in 1/2 AA to D format, with spiral electrodes.