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The increased adoption of consumer mobile devices has made measurement of heat relevant, particularly during battery charge and discharge. The rule of thumb for electronic devices is that for every 10 °C rise in temperature, the average reliability of an electronic device decreases by 50%. Or, if we can lower the temperature by 10 °C, we’ll double the reliability. In other words, we can improve the expected meantime between failures ratings (MTBF) by two times, if the operating temperature is lowered 10 °C.
Charge and discharge currents increase the temperature of batteries, and over time, temperature directly affects the lifespan and storage capacity. Batteries tend to be efficient and provide a normal life span at room temperatures. When batteries are subjected to cold temperatures, their capacity is greatly reduced and as temperatures increase above room temperature, their life span is reduced. At extreme temperatures, batteries can break down in several stages; leakage, smoke, fire and explosion. Manufacturers often perform abuse tests to determine the temperatures for each of the stages of breakdown.
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