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Old 02-02-03, 02:23 PM   #4 (permalink)
Mike C
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The backup bat indicator can show large changes due temperature and minute changes of battery voltage.
Most say it's not important until you get down below 30-40%.
The backup is not supposed to be used unless the main is removed or depleted, but simply measuring the voltage of it continuously will have a slight effect.

You'll want to check your unit to make sure the backup battery is functioning properly, since some have reported loss of data when removing the main battery. Create a backup-restore file first on your PC.
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