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3.6 Term Voltage Also called Terminate Voltage, this is essentially the empty pack voltage where the gauge should ensure 0% state of charge is reported. For learning cycle purposes, this should be set to the minimum voltage of the battery as specified in the manufacturer’s data sheet. After the learning cycle is completed, this value can be adjusted upwards if there is a need for the gauge to report 0% at a higher voltage. If the cell is rated to operate from 3 V to 4.2 V and if the application is a 5s application, the term voltage should be set to 3 V x 5 cells = 15000 mV. This setting is in the Gas Gauging, IT Cfg section of Data Memory. Note that in normal operation the gauge may report 0% at a voltage higher than Term Voltage because it learns the voltage spikes seen by your system. The adds the average of those spikes to Term Voltage in order to predict empty at an earlier voltage so that a sudden spike does not cause a drop to 0%. These learned average spikes are kept in RAM but occasionally updated in the dataflash parameter Delta Voltage. Additionally, if Reserve Cap-mAh and Reserve Cap-cWh are not zero then the gauge further buffers the voltage at which 0% is reported in order to ensure that the reserve capacity is still available for shutdown before Term Voltage+Delta Voltage is actually reached.
