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SECTION 5: TROUBLESHOOTING AND MAINTENANCE
5.5 Batteries, Charging and Calibration
Battery Calibration
Battery Calibration is used to calibrate the battery indicator that displays the battery charge level.
Over time and use, battery capacity decreases, and the displayed charge level becomes less
accurate. To improve accuracy, periodically perform this two-step calibration procedure. (1)
completely discharge the battery and (2) fully charge the battery.
To perform a battery calibration:
1. From the Home screen, tap .
2. From the Settings screen, tap Power Management.
3. From the Power Management screen, tap Calibration.
4. From the Battery Calibration screen, tap to begin battery
calibration.
The battery is discharged by keeping the device operating with the
backlight and touchscreen continuously enabled.
Depending upon capacity and current charge level of the battery,
discharge can take up to 13.5 hours. After complete discharge, if the
display is on, Connect Power is displayed. If the display is off, connect
the power supply or press the Power Switch to turn the device on and
return to the Battery Calibration screen.
5. Connect the power supply to the device to begin charging the
battery.
6. Charge the battery until the amber LED stops blinking and
remains on (while the LED is blinking, calibration will not occur).
This step may take up to 4-6 hours. While charging, with the
display off, pressing the Power Switch turns the display on and
returns to the Battery Calibration screen (the screen remains on
for 10 seconds and then turns off).
7. When charging is completed, a check icon next to Charge
indicates that charging is complete and a check icon next to
Complete indicates that the calibration is complete.
NOTE: At any point in the calibration, tap to stop the battery
calibration. If the battery calibration is stopped, the calibration must be
restarted to calibrate the battery indicator.
8. Tap to return to the Power Management screen.
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