User Guide

RH-51/52, RH-67/68 Company Confidential

6(a) - Baseband Troubleshooting Nokia Customer Care

Backup battery

Symptom of backup battery fault is:

Real Time Clock loses the correct time during short battery removal.

The same symptom can also be seen when the backup battery is empty. About 30 min-

utes is needed to fully charge the backup battery in the device.

NOTE: The backup battery is charged only the same time with main battery charging, or when the device is in

LOCAL or TEST mode.

Always check the backup battery visually for any leakage or any other visual defect.

Check that the backup battery is correctly mounted in the device before closing the

cover.

Check with Phoenix that the backup battery is OK.

Measure the voltage of the backup battery.

• Normal operation when the voltage is > 2.0V.

• Fully charged when the voltage is about 3.2V.

Enable the backup battery charging (start to charge the main battery or boot the device

to LOCAL or TEST mode).

Measure the voltage of the backup battery during charging, it should arise if it is not 3.2

yet.

When the voltage is over 2.0V for sure, check the backup battery with Phoenix.