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## Battery life calculation

The following is a battery life online calculator that calculates the actual working time of the battery based on battery capacity and load.

 Battery working time calculator Battery capacity mAh °C Operating temperature +110°C Under，1% Time before failure (hours) IBAT (Max) IBAT (Typical) nA nA Calculation day day year year year(Consider self-discharge) year(Consider self-discharge) Version 1.0.0
Model and capacity of common button lithium batteries
 Model Capacity +110°C下的1% TTF BR1632 120mAh 1900 hrs CR1632 140mAh 1350 hrs BR1225 48mAh 1900 hrs

The calculator calculates the battery's working time based on battery capacity and load.
among them：
IBAT (Maximum) is the maximum battery current, which is given in the RTC data sheet.
IBAT (Typical) is a typical battery current defined at +25 ° C and nominal supply voltage, which is given in the RTC data sheet.
The operating time (days and years) of the backup battery is estimated using the formula Ah/A, where Ah is the battery capacity expressed in ampere-hours, and A is the load current expressed in amps.
According to the Arrhenius model calculation, consider the backup battery working time under the condition of self-discharge of the battery:
The life-acceleration test estimates the hours before the 1% failure (TTF) and the activation energy (EA). As the operating temperature increases, the self-discharge of the battery will significantly affect the overall operating life of the battery.
In any case, assuming an activation energy of 1 eV, the TTF for several common batteries is given in the table below. In the calculation, the stress temperature (T2) is assumed to be +110 ° C (+383 ° K). Note that different manufacturers, different battery model serial numbers, may have different 1% TTFs, depending on manufacturing tolerances. Contact the battery manufacturer for reliability data of the actual model.