CR2032 DatasheetEEMB Li-MnO2 Battery (Edition: Apr. 2016) 8. Memory Backup Circuit Design Suggestion A primary lithium battery is not rechargeable, when used for memory backup in combination with another power source; current may flow into the battery from the other source. A protection diode and resistor into the circuit is needed to avoid battery charging or over discharging. Select a silicon diode or a diode with minimum leakage current, and design the circuit so that the amount of charging due to leakage current will not exceed 2% of the nominal battery capacity over the total period of use. While used for memory backup, the following circuit shall be applied: 9. Matters Needing Attention Strictly observes the following needing attention. EEMB will not be responsible for any accident occurred by handling outside of the precautions in this specification. ! Caution Use Nickel-plated iron or Nickel-plated stainless steel for the terminals that contact the battery. Make sure that terminal contact pressure is 50g minimum, for a stable contact. Keep the battery and contact terminal surfaces clean and free from moisture and foreign matter. Before inserting the battery, check the battery contact terminals to make sure they are normal, not bent or damaged. (Bent terminals may not make good contact with the battery or may cause short circuit.) 6
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