How to change the battery of a quantum 140 CPU 6xx xx CPU

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Below is the procedure for changing the battery of a 140 CPU 6xx xx CPU.
Step Action
1 While CPU is running, slide the front plastic cover of the LCD screen to open it.
2 Find the battery connector and pull the cable to remove it from its slot.
3 Remove the battery.
4 Insert a new battery.
5 Connect the battery connector in the same slot as the previous one.
6 Check that the Batt Low message on the LCD screen has disappear