Eveready ECR2032 Energizer Lithium Coin Battery, Miniature, Nominal Voltage: 3 V, 240 MILAMP-HR Rated At 15 KOHM, Discharge Cut-Off Voltage: 2 V At 21 DEG C, Electrolyte: Lithium/Manganese Dioxide (Li/MnO2), Positive Terminal: Bottom/Sides, Negative Terminal: Top, Size: CR2032, 20 MM Length, 20 MM W