How do I calibrate the LabQuest battery indicator?

LabQuest Battery Calibration:
This is a quick procedure that will calibrate the LabQuest's charge indicator to the battery that is currently installed. This process does not test the battery, but will make the battery gauge more accurate.
1. Turn on the LabQuest.
2. Connect LabQuest to AC power and let it charge overnight (at least 9 hours) with the power on.
3. With the LabQuest still on, disconnect the fully-charged unit from AC power.
      Note: Leaving the LabQuest on during charging is only necessary when recalibrating the battery.

See also:
     TIL 2075: How do I test the battery on the original LabQuest?
     TIL 2077: Original LabQuest Battery Troubleshooting and FAQs
     TIL 2741: LabQuest 2 Battery Troubleshooting and FAQs