Runtime Is Calculated, Not Measured A UPS can measure electrical quantities such as: But it cannot directly measure “47 minutes remaining.” Runtime is calculated using

Introduction A customer complains that a LiFePO4 battery does not provide enough UPS backup time. The distributor tests the battery at the warehouse and finds

How Does a UPS Decide That a Battery Is “Weak”? A UPS cannot directly look inside the battery and determine its exact remaining capacity. Instead,