ImportantReplace the lithium battery while power to the machine is turned off. Connect the battery connectors before turning on the machine and perform the return-to-origin process.Step 1 Turn off the machine.Step 2 Remove the cover on the lithium battery by loosening mount screws of the cover with aPhillips screwdriver or hex wrench.For locations of the lithium batteries, see “2 Layouts of the serial encoder batteries”.Step 3 Cut and remove the plastic tie fastening the battery using cutting pliers or equivalent.If you replace the battery unit assy, skip this step.Step 4 Disconnect the lithium battery at its connectors.When replacing the battery alone, disconnect the battery cable at the “CN1” connector. When replacing the battery unit assy, disconnect the battery cable at the “CN2” connector, then unscrew the battery board and remove the whole battery unit assy.Step 5 Install the new lithium battery in the reverse order of step 2 and 3. Step 6 Turn on the machine.In the machine start-up process, error message “Ea12902” appears. Ignore the message andproceed.Step 7 Perform the return-to-origin process. Step 8 Connect the battery at its connectors.Step 9 Restart the machine and conform that no error message appears. Step 10 Reinstall the cover on the lithium battery.NoteDispose of waste batteries properly observing your local regulations.