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Contact the battery manufacturer for reliability data regarding a particular model. Note that the 1% TTF will be different across manufacturer and battery model numbers, and will vary with manufacturing tolerances. The calculator assumes that the stress temperature, T2, is +110☌ (+383°K). The activation energy is assumed to be 1eV for all cases and the TTF for some common batteries is shown in the table below. Battery self-discharge becomes a significant contributor to overall operating life as the operating temperature increases. The time to 1% fail (TTF) hours and activation energy, EA, have been estimated from accelerated life testing. The backup time in years with self-discharge calculations is done using an Arrhenius model: I BAT (typ) is the typical battery current defined at both +25☌ and the nominal supply voltage, as noted in the RTC's data sheet.Įstimated backup times in days and years are calculated using the formula Ah/A, where Ah is the battery capacity in ampere-hours and A is the load in amperes.
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