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How do I fix an F64 Replace Battery Fault code for a DG1 drive?

The replace battery fault is an indication that the real time clock battery is depleted. The drive monitors the voltage on the battery and depending on the voltage level it will indicate different status. If the fault occurs with a multi-meter measure the voltage across the battery and depending on the voltage that is read will determine the status. In most cases it would require replacing the battery. Voltage Warning/Fault Battery State <.5V No Warning/ Fault Not Installed>.1V No Warning /Fault Installed 0.6V<>2V Warning Change Battery 2V<>3.8 No Warning /Fault Installed >3.8V Warning Over Voltage